Strengths: emphasises God's aseity, works with several religions, supports the mystics in their ineffable experience of God, builds on the transcendence of God, acknowledges the limits of language, applied/mentioned by several works and people, allows the evocation of a relationship with God, stops anthropomorphisation of God, reduces the human tendency to limit, reminds us of the fact we can never control or capture God
Weaknesses
Brian Davies - we can only compare God to what he has created, and we assume that wisdom and other predicates are also what he has created and not something he is in and of himself, we need to recognise the difference between us and God and everything we say must be metaphorical, also saying what something is not does not mean it can tell you what it is (the ship example is not a good one)
Anthony Flew - little difference between talking about God and nothingness if using negative predicates - 'a death by a thousand qualifications'
Crombie - saying what something isn't is not saying what it is or saying anything significant about it - "the moon isn't made of cheese" then what is it? (ship could describe cupboard or coffin)
Martin Luther - God has spoken to humans directly - 'no violence is to be done to the words of God...they are to be understood in their grammatical and literal sense unless the context plainly forbids'
Many theists make positive statements about God e.g. 'God is love', and do not critically read the Bible for negative predicates within the positive ones - limits communication about God which is a fundamental part of religion
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There is no straightforward interpretation/basis of deciding what God is not that damages the coherence of the theory