Is returning to sins among the signs that fasting is not accepted?

Question:
Is one who returns to sins after Ramadan a sign that his deeds in Ramadan were not accepted?

Answer:
One fears for him; because this is a sign of laxity, and that his repentance is not sincere. The believer should, when Allah grants him the completion of the month, be upright, continue in good, and guard against evil and returning to it. For returning to evil is dangerous; it may be the cause of his deeds being nullified and not accepted. There is no power and no strength except by Allah. We ask Allah for safety.