Adam Clarke

Hold fast the form of sound words - The word ὑποτυπωσις signifies the sketch, plan, or outline of a building, picture, etc.; and here refers to the plan of salvation which the apostle had taught Timothy. No man was left to invent a religion for his own use, and after his own mind. God alone knows that with which God can be pleased. If God did not give a revelation of himself, the inventions of man, in religious things, would be endless error, involving itself in contortions of unlimited confusion. God gives, in his mercy to man, a form of sound words or doctrines; a perfect plan and sketch of the original building; fair and well defined outlines of every thing which concerns the present and eternal welfare of man, and his own glory. In faith and love - Faith credits the Divine doctrines. Love reduces them all to practice. Faith lays hold on Jesus Christ, and obtains that love by which every precept is cheerfully and effectually obeyed.