Therefore to him that knoweth to do good, and doeth it not, to him it is sin.
The general principle is here stated: knowledge without practice is imputed to a man as presumptuous sin. James reverts to James 1:22-24. Nothing more injures the soul than wasted impressions. Feelings exhaust themselves and evaporate, if not embodied in practice. As we will not act except we feel, so, if we will not act out our feelings, we shall soon cease to feel.