For since the beginning of the world men have not {c} heard, nor perceived by the ear, neither hath the eye seen, O God, besides thee, what he hath prepared for him that waiteth for him.

(c) Paul uses the same kind of admiration, 1Co 2:9 marvelling at God's great benefit showed to his Church, by the preaching of the gospel.

Wesley's Notes

64:4 Besides thee - This is to be applied to all the wonderful works, that God at all times wrought for his people: and thus they are a plea with God, that they might well expect such things from him now, that had done such wonderful things for their fathers. Waiteth - This may be taken with reference both to the state of grace and glory, those incomprehensible things that are exhibited through Christ in the mysteries of the gospel.

King James Translators' Notes

seen...: or, seen a God beside thee, which doeth so for him, etc

Jamieson-Fausset-Brown Bible Commentary

4. perceived by the ear-Paul (1Co 2:9) has for this, "nor have entered into the heart of man"; the virtual sense, sanctioned by his inspired authority; men might hear with the outward ear, but they could only by the Spirit "perceive" with the "heart" the spiritual significancy of God's acts, both those in relation to Israel, primarily referred to here, and those relating to the Gospel secondarily, which Paul refers to.

O God . what he . prepared-rather, "nor hath eye seen a god beside thee who doeth such things." They refer to God's past marvellous acts in behalf of Israel as a plea for His now interposing for His people; but the Spirit, as Paul by inspiration shows, contemplated further God's revelation in the Gospel, which abounds in marvellous paradoxes never before heard of by carnal ear, not to be understood by mere human sagacity, and when foretold by the prophets not fully perceived or credited; and even after the manifestation of Christ not to be understood save through the inward teaching of the Holy Ghost. These are partly past and present, and partly future; therefore Paul substitutes "prepared" for "doeth," though his context shows he includes all three. For "waiteth" he has "love Him"; godly waiting on Him must flow from love, and not mere fear.

Matthew Henry's Concise Commentary

64:1-5 They desire that God would manifest himself to them and for them, so that all may see it. This is applicable to the second coming of Christ, when the Lord himself shall descend from heaven. They plead what God had used to do, and had declared his gracious purpose to do, for his people. They need not fear being disappointed of it, for it is sure; or disappointed in it, for it is sufficient. The happiness of his people is bound up in what God has designed for them, and is preparing for them, and preparing them for; what he has done or will do. Can we believe this, and then think any thing too great to expect from his truth, power, and love? It is spiritual and cannot be comprehended by human understanding. It is ever ready. See what communion there is between a gracious God and a gracious soul. We must make conscience of doing our duty in every thing the Lord our God requires. Thou meetest him; this speaks his freeness and forwardness in doing them good. Though God has been angry with us for our sins, and justly, yet his anger has soon ended; but in his favour is life, which goes on and continues, and on that we depend for our salvation.