As the Summa Theologica makes clear, St Thomas Aquinas’ approach to religious language emerged from his concept of God. As a Classical Theist, Aquinas saw God as timeless eternal, meaning that words applied to God cannot be understood univocally, to mean the same as they would when applied to created things. While the Bible, the Creeds and Christian doctrines use language univocally in ways that make God seem like a person, subject to limitation and change, for Aquinas God is timelessly other and should not be so anthropomorphised and limited by language. He saw some merits in the apophatic approach to language, which speaks of God by negation if at all seeing direct religious language as equivocal, but wanted to preserve the possibility of affirming some things about God in a meaningful way, recognising that an equivocal approach to language undermines philosophy and doctrine in a way that must eventually be fatal to organised religion. The result was Aquinas’ argument that words applied to God should be understood as analogies which is successful in avoiding both the pitfalls of univocalism and giving in to equivocalism, although it depends heavily on his concept of God and so may not be useful to all Christians.
Firstly, Aquinas claimed that claims such as “God is good” should not be taken to imply that God is morally good, such as would imply choice and the existence of independent values but should instead be understood as analogies of proportion. When we say that something is good, we mean that it largely fulfils its nature. Human nature is to be free and moral, but if God is the origin of our freedom and of moral values it makes little sense to anthropomorphise him by assuming his nature is like ours. Nothing in this world is perfect; because of time and space nothing can fulfil 100% of its nature. For example, a person has the potential to be a baby and an adult. However good they are, they can only fulfil part of their potential at one time, such as by being a good adult. Nevertheless, God is outside the time and space that holds us back from actualising our full potential and being perfect. When we say that God is good, we mean that God fulfils 100% of his timeless divine nature, being changelessly perfect; what it is for God to fulfil God’s nature is not what it means for us to fulfil our more limited nature. John Hick used the example of a man and his dog, both of which might be said to be faithful. What it is for a man to be faithful and for a dog to be faithful are not quite the same, but by saying they are faithful we mean that both do a large proportion of what we expect of a faithful member of their species. It follows that our goodness is not the same as God’s goodness… the word good is not used univocally when applied to God… but there is a connection between our goodness and God’s goodness which means that words applied to God are not equivocal either. In this way, Aquinas’ analogy of proportion is successful in avoiding both the pitfalls of univocalism and giving into equivocalism.
Secondly, Aquinas claimed that attributes like goodness exist primarily in God as the creator and only secondarily in created things, so that what we say about God and created things is connected while still having different meanings and preserving the otherness of God. To explain his analogy of attribution, Aquinas used the example of a bull and its urine… the health of the bull is primary and the health of the urine it produces is secondary… the health of the bull and its urine consist in different things, but the health of the one is the source of the health of the other, so there is a connection. Simon Oliver uses the example of me and my breakfast yoghurt… both might be said to be healthy, but the healthiness of the yoghurt is secondary and depends on my healthiness, which is primary. My health might consist in having clear skin, energy and a habit of going jogging… but the health of the yoghurt does not consist in any of these things. In the same way, the goodness, power or wisdom of God is primary, and the goodness, power or wisdom of created things is secondary. What it is for God to be good, powerful or wise might be radically different from what it means for a person to be these things, and not only by degree, avoiding limiting God through a univocal use of language. Yet, there is a clear connection between the goodness, power and wisdom of God and of created creatures, which avoids an equivocal approach to religious language also.
On the other hand, as Anthony Kenny pointed out the analogical meaning of God’s attributes preserved by Aquinas is extremely limited, making this approach to religious language unsuccessful when it comes to sustaining religion in a practical way. Kenny suggested that the idea of timeless attributes such as goodness, power or wisdom seems “radically incoherent”, which is a fair criticism, as is the related point that many believers do not understand language analogically, even those who lead or have led the Church. While Ian Ramsey was right to point out how people often use “qualifiers” like “timelessly” to signify that their use of words to describe God should not be taken as “ordinary language” but as religious language which is “logically odd”, in practice many people do not use such qualifiers or seem to understand that there should be any difficulty in using language univocally at all. Further, as Nelson Pike observed, the God of the Bible is “unavoidably tensed”. It makes little sense to see God as timeless when that would make the creation, the fall and the resurrection simultaneous in God’s timeless vision. This is why Protestant philosophers look for other ways of understanding religious language, seeing Aquinas analogical approach as bound up in a concept of God which is fundamentally unchristian. John MacQuarrie lamented the adoption of the Greek concept of God into the Christian tradition, seeing this as the cause of multiple avoidable philosophical problems that have beset the faith through the best part of two millennia. In this context, Richard Swinburne and Nicholas Wolterstorff approach religious language in a more straightforward univocal way. Further, some Classical Theists support a more univocal approach to religious language than Aquinas. For examples, St Anselm and John Duns Scotus reasoned that God as creator must have created the concepts through which we understand and speak of Him, meaning that we can speak confidently about God using a far wider range of words and meanings than Aquinas would allow. All of this suggests that the success of Aquinas’ analogical approach to religious language is limited to those who share his concept of God and does not extend even to all of those.
In conclusion, Aquinas’ analogical approach to understanding religious language is coherent and persuasive if one shares his concept of God, although it is possibly too limited to support religious practice. Nevertheless, many Christians do not accept either Aquinas’ concept of God or his analogical approach to understanding religious language because they choose to focus on revealed rather than on natural theology as the primary source of their knowledge of God.