Question 114: But can those who are converted to God perfectly keep these commandments?

Answer: No: but even the holiest men, while in this life, have only a small beginning of this obedience; (a) yet so, that with a sincere resolution they begin to live, not only according to some, but all the commandments of God. (b)

(a) 1 John 1:8-10 If we say that we have no sin, we deceive ourselves, and the truth is not in us. If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness. If we say that we have not sinned, we make him a liar, and his word is not in us.
Rom.7:14,15 For we know that the law is spiritual: but I am carnal, sold under sin. For that which I do I allow not: for what I would, that do I not; but what I hate, that do I.

Eccl.7:20 For there is not a just man upon earth, that doeth good, and sinneth not.

1 Cor.13:9 For we know in part, and we prophesy in part.
(b) Rom.7:22 For I delight in the law of God after the inward man:

Ps.1:2 But his delight is in the law of the LORD; and in his law doth he meditate day and night.

James 2:10 For whosoever shall keep the whole law, and yet offend in one point, he is guilty of all.