So it is not irreligious, idle, or superfluous, but in the highest degree wholesome and necessary, for a Christian to know whether or not his will has anything to do in matters pertaining to salvation.
Part II, Section iii
For if I am ignorant of the nature, extent and limits of what I can and must do with reference to God, I shall be equally ignorant and uncertain of the nature, extent and limits of what God can and will do in me - though God, in fact, works all in all (cf. 1 Cor. 12.6). Now, if I am ignorant of God's works and power, I am ignorant of God himself; and if I do not know God, I cannot worship, praise, give thanks or serve Him, for I do not know how much I should attribute to myself and how much to Him. We need, therefore, to have in mind a clear-cut distinction between God's power and ours, and God's work and ours, if we would live a godly life.