futility of secrecy before Allah

أَمْ يَحْسَبُونَ أَنَّا لَا نَسْمَعُ سِرَّهُمْ وَنَجْوَىٰهُم ۚ بَلَىٰ وَرُسُلُنَا لَدَيْهِمْ يَكْتُبُونَ

Or do they think that We hear not their secrets and their private conversations? Yes, [We do], and Our messengers [i.e., angels] are with them recording.