Can those who are converted to God keep these Commandments perfectly?

Heidelberg Catechism

Question 114. Can those who are converted to God keep these Commandments perfectly?

Answer. No, but even the holiest men, while in this life, have only a small beginning of such obedience,[1] yet so that with earnest purpose they begin to live not only according to some, but according to all the Commandments of God.[2]

[1] Ecc 7:20; Rom 7:14-15; 1 Cor 13:9; 1 Jn 1:8-10;
[2] Job 9:2-3; Ps 1:1-2, 19:13; Rom 7:22-25; Php 3:12-16; Jas 2:10-11