The motives on which to act when doing good or engaged in acts of piety, down to verse 18.
18. Good done, referring to the Lord only therein.
19. The spring or motive of conduct as to what the heart is set on; confidence in a Father.
19-34. Through singleness of eye, and so just motives; confidence in God.
This chapter may, not only to verse 18, but all be considered as a question of our religious state, for it is seeking the kingdom of God and His righteousness in contrast with worldly objects and cares.