The believers can never have any pleasure from sin. On the contrary, he would not even pursue sin, except with grief in his heart. But intoxication of desires obscures us from feeling this remorse. When the heart becomes empty from such grief and we are happy with the sin, then we should question our faith and weep for the death of our hearts.
If one were alive, he would be sad for the perpetration of any sin – big or small.
Indeed, the evil effects of sin – more times than not – go unnoticed in us. Hence diligence in constant self-evaluation is necessary in leading us away from sin and its destructive ends. Do this by focusing on the following:
1. Fear of dying before one is able to make tawbah.
2. Remorse about the good that was missed because of the disobedience of Allah.
3. Working seriously on regaining what has been missed.
Madaarij us-Saalikeen, by Ibn al-Qayyim rahimahullah (paraphrased)