Francis A. Schaeffer said this quote

“ Now having travelled from the pride of man in the High Renaissance and the Enlightenment down to the present despair, we can understand where modern people are. They have no place for a personal God. But equally they have no place for man as man, or for love, or for freedom, or for significance. This brings a crucial problem. Beginning only from man himself, people affirm that man is only a machine. But those who hold this position cannot live like machines! If they could, there would be no tensions in their intellectual position or in their lives. But even people who believe they are machines cannot live like machines, and thus they must “leap upstairs” against their reason and try to find something which gives meaning to life, even though to do so they have to deny their reason.This was a solution Leonardo da Vinci and the men of the Renaissance never would have accepted, even if, like Leonardo they ended their thinking in despondency. They would not have done so, for they would have considered it intellectual suicide to separate meaning and values from reason this way. And they would have been right. Such a solution is intellectual suicide, and one may question the intellectual integrity of those who accept such a position when their starting point was pride in the sufficiency of human reason. ”