Holiness and work are closely related because of the need to persevere in personal discipline, and discipline takes time and effort. As Paul advises Timothy, “Exercise thyself rather unto godliness” (1 Tim. 4:7). Holiness is not achieved sloppily or instantaneously; it calls for continual commitment, diligence, practice, and repentance. . . . How critical it is that we live each day in total commitment to God, forming habits of holiness, rooting out every inconsistency, and refusing to fall prey to the one-more-time syndrome. Remember, postponed obedience is disobedience. Tomorrow’s holiness is impurity now. Tomorrow’s faith is unbelief now. Aim not to sin at all (1 John 2:1) and ask for divine strength to bring every thought into captivity to Christ (2 Cor. 10:5), for Scripture indicates that our thought lives ultimately determine our character: “For as he thinketh in his heart, so is he” (Prov. 23:7).
Adapted from Joel R. Beeke, Living for God’s Glory: An Introduction to Calvinism (Kindle Edition)