It was Canon Holmes, of India, who more than twenty-five years ago called attention to the inferential character of the average man’s faith in God. To most people God is an inference, not a reality. He is a deduction from evidence which they consider adequate; but He remains personally unknown to the individual. `He must be,’ they say, `therefore we believe He is.’ Others do not go even so far as this; they know of Him only by hearsay. They have never bothered to think the matter out for themselves, but have heard about Him from others, and have put belief in Him into the back of their minds along with the various odds and ends that make up their total creed. To many others God is but an ideal, another name for goodness, or beauty, or truth; or He is law, or life, or the creative impulse back of the phenomena of existence. These notions about God are many and varied, but they who hold them have one thing in common: they do not know God in personal experience. The possibility of intimate acquaintance with Him has not entered their minds. While admitting His existence they do not think of Him as knowable in the sense that we know things or people.
Christians, to be sure, go further than this, at least in theory. Their creed requires them to believe in the personality of God, and they have been taught to pray, `Our Father, which art in heaven.‘ Now personality and fatherhood carry with them the idea of the possibility of personal acquaintance. This is admitted, I say, in theory, but for millions of Christians, nevertheless, God is no more real than He is to the non-Christian. They go through life trying to love an ideal and be loyal to a mere principle.
Over against all this cloudy vagueness stands the clear scriptural doctrine that God can be known in personal experience. A loving Personality dominates the Bible, walking among the trees of the garden and breathing fragrance over every scene. Always a living Person is present, speaking, pleading, loving, working, and manifesting Himself whenever and wherever His people have the receptivity necessary to receive the manifestation.
from The Pursuit of God by A.W. Tozer Chapter 4: Apprehending God