I am aware that there are those who love to poke fun at the plain man's idea of reality. They are the idealists who spin endless proofs that nothing is real outside of the mind. They are the relativists who like to show that there are no fixed points in the universe from which we can measure anything. They smile down upon us from their lofty intellectual peaks and settle us to their own satisfaction by fastening upon us the reproachful term "absolutist." The Christian is not put out of countenance by this show of contempt. He can smile right back at them, for he knows that there is only One who is Absolute, that is God. But he knows also that the Absolute One has made this world for man's use, and while there is nothing fixed or real in the last meaning of the words (the meaning as applied to God), for every purpose of human life we are permitted to act as if there were. And every man does act thus except the mentally sick. These unfortunates also have trouble with reality, but they are consistent; they insist upon living in accordance with their ideas of things. They are honest, and it is their very honesty which constitutes them a social problem.
The idealists and relativists are not mentally sick. They prove their soundness by living their lives according to the very notions of reality which they in theory repudiate and by counting upon the very fixed points which they prove are not there. They could earn a lot more respect for their notions if they were willing to live by them; but this they are careful not to do. Their ideas are brain-deep, not life-deep. Wherever life touches them they repudiate their theories and live like other men.
The Christian is too sincere to play with ideas for their own sake. He takes no pleasure in the mere spinning of gossamer webs for display. All his beliefs are practical. They are geared into his life. By them he lives or dies, stands or falls for this world and for all time to come. From the insincere man he turns away. The sincere, plain man knows that the world is real. He finds it here when he wakes to consciousness, and he knows that he did not think it into being. It was here waiting for him when he came, and he knows that when he prepares to leave this earthly scene it will be here still to bid him goodbye as he departs. By the deep wisdom of life he is wiser than a thousand men who doubt. He stands upon the earth and feels the wind and rain in his face, and he knows that they are real. He sees the sun by day and the stars by night. He sees the hot lightning play out of the dark thundercloud. He hears the sounds of nature and the cries of human joy and pain. These he knows are real. He lies down on the cool earth at night and has no fear that it will prove illusory or fail him while he sleeps. In the morning the firm ground will be under him, the blue sky above him and the rocks and trees around him as when he closed his eyes the night before. So he lives and rejoices in a world of reality. With his five senses he engages this real world. All things necessary to his physical existence he apprehends by the faculties with which he has been equipped by the God who created him and placed him in such a world as this. Now by our definition also God is real. He is real in the absolute and final sense that nothing else is. All other reality is contingent upon His.
- A.W. Tozer, The Pursuit of God (from Ch. 4: Apprehending God)