The Greek term has…nothing to say of inspiring or of inspiration: it speaks only of 'spiring' or 'spiration'. What is says of Scripture is, not that it is 'breathed into by God' or is the product of the Divine 'inbreathing' into its human authors, but that it is breathed out by God, 'God-breathed', the product of the creative breath of God... When Paul declares, then, that 'every Scripture', or 'all Scripture' is the product of the Divine breath, 'is God-breathed', he asserts with as much energy as he could employ that Scripture is the product of a specifically Divine operation.
B.B. Warfield