The world is a map of situations, inscribed with lines of demarcation, diversified everywhere with discriminative colors, which indicate opportunity, adaptation, want, fulfillment, duty. In one place the poor are to be aided; in another place the ignorant are to be instructed; in another the sick are to be consoled and watched over. In one place is the demarcation of endurance; in another is the arena of action; in another is the platform of authority and eloquence. But who, in beholding any one of these various demarcations and the duties it suggests, goes to God and asks: — Am I the man whom eternal wisdom has selected for this mission? Resigning my own will, I lay myself upon the altar of sacrifice, not to be what I might choose to be, but to be what God may choose to have me to be. Send me, if thou wilt; but let me not go, or have a thought of going, without thine own authority.
— edited from A Treatise on Divine Union (1851) Part 6, Chapter 9.