Surely no rebel can expect the King to pardon his treason while he remains in open revolt. No one can be so foolish as to imagine that the Judge of all the earth will put away our sins if we refuse to put them away ourselves. All of Grace (116)
Repentance is a discovery of the evil of sin, a mourning that we have committed it, a resolution to forsake it. It is, in fact, a change of mind of a very deep and practical character, which makes the man love what once he hated, and hate what once he loved.
Repentance causes a change in the affections, which move under the will as the commander-in-chief. It metamorphoses the affections. It turns rejoicing in sin into sorrowing for sin; it turns boldness in sin into holy shame; it turns the love of sin into hatred.Ten Commandments, 207
As a body without a soul, much wood without fire, a bullet in a gun without powder, so are words in prayer without spirit.Commentary on Old/New Testaments 5 - 334
A man may as truly say, the sea burns, or fire cools, as that certainty of salvation breeds security and looseness.Commentary on the Old and New Treatments, 5
The nature of true repentance is clearly and unmistakably laid down in holy Scripture.
It begins with knowledge of sin.
It goes on to work sorrow for sin.
It leads to confession of sin before God.
It shows itself before man, by a thorough breaking off from sin.
It results in producing a habit of deep hatred for all sin.
Above all, it is inseparably connected with lively faith in the Lord Jesus Christ. Repentance like this is the characteristic of all true Christians.Gospel of Luke Commentary
we have to remember that genuine repentance is more fundamentally a matter of the heart's attitude toward sin than it is a mere change of behaviour. What is the Gospel?(81)
There is an eternal difference between regret and repentance. Regret feels bad about past sins. Repentance turns away from past sins. Regret looks to our own circumstances. Repentance looks to God. Most of us are content with regret. We just want to feel bad for awhile, have a good cry, enjoy the cathartic experience, bewail our sin, and talk about how sorry we are. But we don't want to change. We don't want to deal with God.
Let us beware of any repentance, falsely so called, which is not of this character. Action is the very life of "repentance unto salvation." Feelings, and tears, and remorse, and wishes, and resolutions, are all useless, until they are accompanied by action and a change of life. In fact they are worse than useless. Insensibly they sear the conscience and harden the heart.
J. C. Ryle. Expository Thoughts on the Gospels
Repentance is a heartfelt sorrow for sin, a renouncing of it, and a sincere commitment to forsake it and walk in obedience to Christ.Systematic Theology
Repentance unto life is a saving grace, whereby a sinner, out of an apprehension of his sin, and apprehension of the mercy of God in Christ, does, with grief and hatred of his sin, turn from it, unto God, with full purpose of, and endeavour after, new obedience.Westminster Shorter Catechism, Question 87
Repentance means turning from as much as you know of your sin to give as much as you know of yourself to as much as you know of your God, and as our knowledge grows at these three points so our practice of repentance has to be enlarged.