1 Corinthians 2:9 - Matthew Poole's English Annotations on the Holy Bible

The place where this is written is by all agreed to be Isaiah 64:4, where the words are, For since the beginning of the world men have not heard, nor perceived by the ear, neither hath the eye seen, O God, beside thee, what he hath prepared for him that waiteth for him. It is so usual with the penmen of holy writ to quote the sense of texts in the Old Testament, not tying themselves to letters and syllables, that it is mightily vain for any to object against this quotation, as no where written in the Old Testament, but taken out of some apocryphal writings. The sense of what is written, Isaiah 64:4, is plainly the same with what he speaketh in this place; the greatest difference is, the apostle saith, them that love him; the prophet, him that waiteth for him (which is the certain product and effect of love). The whole 64th chapter of Isaiah, \Isaiah 64:1-12\ and some Chapter s following, treat concerning Christ; so doth this text. Christ and his benefits are to be understood here, by the things which God hath prepared for them that love him; which are set out as things not obvious to sense, nor to be comprehended by reason. It could never have entered into the heart of men to conceive, that God should give his only begotten Son out of his own bosom, to take upon him our nature, and to die upon the cross; or, that Christ should so far humble himself, and become obedient unto death.