The sense for the realness of God will not be found in insipid concepts; in opinions that are astute, arid, timid; in love that is scant, erratic. Sensitivity to God is given to a broken heart, to a mind that rises above its own wisdom. It is a sensitivity that bursts all abstractions. It is not a mere playing with a notion. There is no conviction without contrition; no affirmation without self-engagement. Consciousness of God is a response, and God is a challenge rather than a notion. We do not think Him, we are stirred by Him. We can never describe Him, we can only return to Him. We may address ourselves to Him; we cannot comprehend Him. We can sense His presence; we cannot grasp His essence.
His is the call, ours the paraphrase; His is the creation, ours a reflection. He is not an object to be comprehended, a thesis to be endorsed; neither the sum of all that is (facts) nor a digest of all that ought to be (ideals). He is the ultimate subject.
The trembling sense for the hereness of God is the assumption of our being accountable to Him. God-awareness is not an act of God being known to man; it is the awareness of man's being known by God. In thinking about Him we are thought by him.
~God in Search of Man by Abraham Joshua Heschel, pages 159-160