Hakim al Umma Maulana Ashraf Ali Thanvi (Allah have mercy on him) said instructing a seeker,

There are five components of perfect repentance (توبہ کاملہ) ,

1. Acknowledgement of the wrongdoing

2. Feeling remorse for this

3. Asking forgiveness

4. Reaffirming determination not to do it again

5. Planning for rectification(اصلاح) [of the blameworthy morals that led to indulgence in it].

Husn al Aziz, volume 1, part 2, p 152