وَأَسِرُّوا۟ قَوْلَكُمْ أَوِ ٱجْهَرُوا۟ بِهِۦٓ ۖ إِنَّهُۥ عَلِيمٌۢ بِذَاتِ ٱلصُّدُورِ
Wa asirroo qawlakum awijharoo bihee innahoo 'aleemum bizaatis sudoor
Whether you keep your words secret or state them openly, He knows the contents of every heart.
Whether you keep your speech hidden or speak it aloud, he knows what lies within every heart.
Verse 12 has just commended people who fear a Lord they cannot see. Hiddenness runs the other way here, and the pairing is deliberate: the ones for whom God is unseen are fully visible to him. Verse 14 completes the argument from making, asking whether a maker could be ignorant of what he made.