Realization is the process of effort to change the soul and reformation is the actual change of the soul. If the soul is reformed, the proof for it is that the sin is not practically repeated. If this result is achieved, there is no need of punishment. The punishment is not for the sake of past sin, since past is past. The punishment is only to change the soul so that in future the sin is not repeated.

The day you have stopped repeating the sin, you are excused by God for the past sin. This is the only way to stop the punishment of sin, which is in the form of problems of life. If you have stopped all the sins, your life will be the happiest and for this you need not pray even God. Prayer to God will not cancel even the trace of the sin.

Ravana prayed Lord Shiva in several ways, but, he could not escape the punishment of his sin. If you are committing sin, you are violating the word of God and going against the will of God. God wants you not to commit any sin. His word is the ethical scripture, which says that you should not commit any sin. The sin will disturb the balance of the society since it hurts the co-living beings.