God is not an outward gush of sentiment, not a vague abstraction of impersonal good nature: God is a living, intense reality, and until this truth is grasped, the puzzles and questions are more than can be met. But when by the discipline of His divine guidance, we know Him, and that His going with us give us rest, then time and eternity are merged and lost in that amazingly vital relationship. The union is not one of mystic contemplation, but of intense perfection of activity; not the rest of the placid peace of stagnation, but the rest of perfect motion.
— Oswald Chambers, Christian Disciplines, 1936
Therefore, my beloved, as you have always obeyed, so now, not only as in my presence but much more in my absence, work out your own salvation with fear and trembling, for it is God who works in you, both to will and to work for his good pleasure.
Philippians 2:12-13 (ESV)