From Isa 64:4, freely rendered by Septuagint. The Hebrew reads: “From of old men have not heard, not perceived with the ear, eye has not seen a God beside Thee who does (gloriously) for him who waits on Him.” Septuagint, “From of old we have not heard, nor have our eyes seen a God beside Thee, and Thy works which Thou wilt do for those who wait for mercy.” Paul takes only the general idea from the Old-Testament passage. The words are not to be limited to future blessings in heaven. They are true of the present.
Have entered (ἀνέβη)
Lit., went up. See on Act 7:23. Compare Dan 2:29, Sept.