Ibn al-Qayyim (may Allaah have mercy on him) said:

Sins generate more sins, and one leads to another, until they overpower a man and he finds it difficult to repent from that. As one of the earlier generation said: One of the punishments of bad deeds is more bad deeds, and one of the rewards of good deeds is more good deeds.

Al-Jawaab al-Kaafi (p. 36)