Is repentance from a sin valid if the person returns to it and then repents?

Question:
The sister questioner says in this question: If a woman repents from a sin with sincere repentance, then returns to it, and then repents again, is this repentance accepted? And what are its conditions?

Answer:
Yes, whenever a Muslim commits a sin, he repents to Allah. Even if he falls into the sin again, he does not despair of Allah’s mercy and does not lose hope in Allah’s mercy. He repeats his repentance sincerely, and Allah accepts his repentance. The conditions of repentance are well known: abandoning the sin and leaving it, not intending to return to it, resolving not to return to it, and feeling remorse for the sins he committed. Yes.