Regret for missed opportunities to obey Allah

خَـٰشِعَةً أَبْصَـٰرُهُمْ تَرْهَقُهُمْ ذِلَّةٌ ۖ وَقَدْ كَانُوا۟ يُدْعَوْنَ إِلَى ٱلسُّجُودِ وَهُمْ سَـٰلِمُونَ

Their eyes humbled, humiliation will cover them. And they used to be invited to prostration while they were sound.