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.(Isa 64:4)

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.(1 Cor 2:9)
The world fears the power of the atom, yet we belong to the God of the universe, who not only created that atomic power but also raised Jesus Christ from the dead. God’s incomparably great power is available to help you. There is nothing too difficult for him.
I have not stopped giving thanks for you, remembering you in my prayers. I keep asking that the God of our Lord Jesus Christ, the glorious Father, may give you the Spirit of wisdom and revelation, so that you may know him better. I pray that the eyes of your heart may be enlightened in order that you may know the hope to which he has called you, the riches of his glorious inheritance in his holy people, and his incomparably great power for us who believe. That power is the same as the mighty strength he exerted when he raised Christ from the dead and seated him at his right hand in the heavenly realms, far above all rule and authority, power and dominion, and every name that is invoked, not only in the present age but also in the one to come. (Eph 1:16-21)
We do, however, speak a message of wisdom among the mature, but not the wisdom of this age or of the rulers of this age, who are coming to nothing. No, we declare God’s wisdom, a mystery that has been hidden and that God destined for our glory before time began.
None of the rulers of this age understood it, for if they had, they would not have crucified the Lord of glory. However, as it is written: “What no eye has seen, what no ear has heard, and what no human mind has conceived”— the things God has prepared for those who love him—
These are the things God has revealed to us by his Spirit. The Spirit searches all things, even the deep things of God.For who knows a person’s thoughts except their own spirit within them? In the same way no one knows the thoughts of God except the Spirit of God.What we have received is not the spirit of the world, but the Spirit who is from God, so that we may understand what God has freely given us. This is what we speak, not in words taught us by human wisdom but in words taught by the Spirit, explaining spiritual realities with Spirit-taught words.
The person without the Spirit does not accept the things that come from the Spirit of God but considers them foolishness, and cannot understand them because they are discerned only through the Spirit. The person with the Spirit makes judgments about all things, but such a person is not subject to merely human judgments, for, “Who has known the mind of the Lord so as to instruct him?” But we have the mind of Christ. (1 Cor 2:6-16)
[We]need to dwell upon the assurances of God’s Word, to hold them before the mind’s eye. Point by point, day by day, repeat the lessons there given, over and over, until you learn the bearing and import of them. We see a little today, and by meditation and prayer, more tomorrow. And thus little by little we take in the gracious promises until we can almost comprehend their full significance. {6BC 1085.2}
How much we lose by not educating the imagination to dwell upon divine things, rather than upon the earthly! We may give fullest scope to the imagination, and yet,
“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.”
Fresh wonders will be revealed to the mind the more closely we apply it to divine things. We lose much by not talking more of Jesus and of heaven, the saints’ inheritance. The more we contemplate heavenly things, the more new delights we shall see, and the more will our hearts be brimful of thanks to our beneficent Creator {6BC 1085.3}
It is the duty and privilege of all to use reason as far as humanity’s finite faculties can go; but there is a boundary where our mortal resources must cease. There are many things that can never be reasoned out by the strongest intellect or discerned by the most penetrating mind. Philosophy cannot determine the ways and works of God; the human mind cannot measure infinity. {6BC 1079.7}
Jehovah is the fountain of all wisdom, of all truth, of all knowledge. There are high attainments that people can reach in this life through the wisdom that God imparts; but there is an infinity beyond that will be the study and the joy of the saints throughout eternal ages. We can now only linger upon the borders of that vast expanse, and let imagination take its flight. Finite humanity cannot fathom the deep things of God; for spiritual things are spiritually discerned. The human mind cannot comprehend the wisdom and power of God {6BC 1079.8}
Now this is eternal life: that they know you, the only true God, and Jesus Christ, whom you have sent. (John 17:3)
Avoiding Guesswork in the Quest for God.
Human talent and human conjecture have tried by searching to find out God. But guesswork has proved itself to be guesswork. Man cannot by searching find out God. This problem has not been given to human beings. All that man needs to know and can know of God has been revealed in His Word and in the life of His Son, the great Teacher. {6BC 1079.9}
God cannot be understood by humans. His ways and works are past finding out. In regard to the revelations that He has made of Himself in His Word, we may talk, but other than this, let us say of Him, Thou art God, and Thy ways are past finding out. {6BC 1079.11}
There is a knowledge of God and of Christ which all who are saved must have. “This is life eternal,” Christ said, “that they might know thee the only true God, and Jesus Christ, whom thou hast sent.”
{6BC 1079.12}
The question for us to study is, What is truth–the truth for this time, which is to be cherished, loved, honored, and obeyed? The devotees of science have been defeated and disheartened in their effort to find out God. What they need to inquire is, What is truth {6BC 1079.13}
To Know Christ Is to Practice His Words.
Now this is eternal life: that they know you, the only true God, and Jesus Christ, whom you have sent. (John 17:3)
These words mean much. It is only by knowing Christ that we can know God. The Sent of God calls upon all to listen to these words. They are the words of God, and all should give heed to them; for by them they will be judged. To know Christ savingly is to be vitalized by spiritual knowledge, to practice His words. Without this, all else is valueless {5BC 1145.11}