Matthew Poole and continuators on 2 Timothy 1:13

13 Hold fast the form of sound words which thou hast heard of me in faith , and love, which is in Christ Jesus .

By sound words which he had heard from Paul, can be meant nothing but the Doctrine of the Gospel, which as it is it self pure, and consistent with it self, not rotten; one piece of which will not hold with the other, so it tends to make Souls sound, as to their Spiritual health, this Doctrine Timothy had been instructed in by Paul, whether he had given him a written form of them or no, is not much material, for this (if he did) was not that which he would have him hold fast, but to keep the Idea, or pattern of that Doctrine in his mind written in his heart, making his discourses conform to it.

The sum of which form of sound words, he declareth to be Faith and Love, for all that the Gospel teacheth, is either believing in the Lord Jesus Christ, or keeping his Commandements, which is the demonstration of Love, Iohn 14.15. or else the sense may be this, keep thy self sound in the principles of Religion, which thou hast learned of me.

But do not think this enough without exercising a Faith in Christ as thy Redeemer, and living in obedience to his Commandments. Many an Orthodox man may go to Hell, notwithstanding his Orthodoxy.

Marginal references: chap. 3.14.