When comparing and contrasting different verses in the Bible it is important to remember that everyone interprets them differently and there is not necessarily a wrong or right interpretation. This is called hermeneutics, the branch of knowledge that focuses on the interpretation of the Bible (or other important literary texts). It is a bit difficult to compare Corinthians 2:6-12 and Isaiah 64:4 because Corinthians is from the New Testament and Isaiah 64:4 is from the Old Testament. When I read these two passages I feel they are alike in that they both tell us that God is here in Spirit, even though we cannot hear Him or see Him. Once we accept God into our hearts is when we can actually feel the true love He has for us. We must have faith in God and this faith will bring us eternal salvation. Again, this is purely interpretation and could mean many different things to others.
Here are the verses from the King James Bible Online:
(4)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.
(6) Howbeit we speak wisdom among them that are perfect: yet not the wisdom of this world, nor of the princes of this world, that come to nought: (7) But we speak the wisdom of God in a mystery, even the hidden wisdom, which God ordained before the world unto our glory: (8) Which none of the princes of this world knew: for had they known it, they would not have crucified the Lord of glory. (9) But as it is written, Eye hath not seen, nor ear heard, neither have entered into the heart of man, the things which God hath prepared for them that love him. (10) But God hath revealed them unto us by his Spirit: for the Spirit searcheth all things, yea, the deep things of God. (11) For what man knoweth the things of a man, save the spirit of man which is in him? even so the things of God knoweth no man, but the Spirit of God. (12) Now we have received, not the spirit of the world, but the spirit which is of God; that we might know the things that are freely given to us of God.