What is meant by "sins of seclusion" and how can one get rid of them, and what is the connection between them and the hadith, "Sin is what agitates your soul and what you would dislike for people to know about"?

A Muslim is susceptible to sin and transgression, and he must hasten to repent and seek forgiveness, for Allah rejoices in the repentance of His servant. Allah has condemned those who conceal their sins from people but not from Allah, and the Prophet warned against sins committed in private (dhunub al-khalawat) which nullify good deeds. To eliminate them:

1. Supplication (Du'a): Seeking refuge in Allah to avert sins. 2. Striving against the self (Mujahadat al-nafs): Purifying and obeying it. 3. Contemplating the warning: Fearing that the severe warning might apply to those who commit sins in private. 4. Feeling Allah's watchfulness (Isti'shar al-muraqabah): Remembering that Allah is watching and aware. 5. Imagining people's respect: Feeling shyness before Allah more than before creation. 6. Remembering death: If it were to come while one is engaged in sin. 7. Remembering Paradise and Hellfire: Reflecting on Allah's punishment and reward.

The Hadith of Nawwas bin Sam'an: "Sin is that which wavers in your heart and which you dislike for people to find out about" is a criterion for recognizing sin when there is doubt, and it is specific to one whose heart is pure and sound. So, what one feels ashamed to do in front of people is a transgression.