The Fundamental Resources of Personality
There are resources of personality known only to God. Psalm 139 is the prayer of a man asking God to explore him where he cannot go, and to garrison him. In 1 Thessalonians 2:10, Paul is alluding to the working out of what God works in. The majority of us keep taking in and forget altogether that somehow we must work out what we take in: we cannot elude our destiny, which is practical. The profound nature of each one of us is created by God, but our perception of God depends entirely upon our own determined effort to understand what we come in contact with, and that perception is always coloured by the ruling disposition. If my ruling disposition is self-interest, I perceive that everything that happens to me is always for or against my self-interest; if, on the other hand, my ruling disposition is obedience to God, I perceive Him to be at work for my perfecting in everything that happens to me.
Chambers, O. (1936). The moral foundation of life: a series of talks on the ethical principles of the Christian life. Hants UK: Marshall, Morgan & Scott.