A careful conscientious obedience to his commands shows that the apprehension and knowledge of these things are graciously impressed upon the soul; and therefore it must follow in the reverse that he that saith, I know him, and keepeth not his commandments, is a liar, and the truth is not in him, v. 4. Professors of the truth are often ashamed of their ignorance, or ashamed to own it; they frequently pretend to great attainments in the knowledge of divine mysteries: Thou makest thy boast of God, and knowest his will, and approvest (in thy rational judgment) the things that are more excellent, being instructed out of the law and art confident that thou thyself art (or art fit to be) a guide to the blind, etc., Rom. 2:17, etc. But what knowledge of God can that be which sees not that he is most worthy of the most entire and intense obedience? And, if that be seen and known, how vain and superficial is even this knowledge when it sways not the heart unto obedience! A disobedient life is the confutation and shame of pretended religious knowledge; it gives the lie to such boasts and pretences, and shows that there is neither religion nor honesty in them.