According to Isaiah, God has special things planned for people who are patient and trust in Him, and these things are so amazing that no one has ever seen or heard about them before. It's like a wonderful surprise that only God knows about and will give to those who wait.
Isaiah 64:4: 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. [seen...: or, seen a God beside thee, which doeth so for him, etc]
Isaiah 64:4 speaks about God acting for those who wait for Him, while 1 Corinthians 2:9 emphasizes the unimaginable things God has prepared for those who love Him, suggesting a different condition.
1 Corinthians 2:9: 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.