6يولِجُ اللَّيلَ فِي النَّهارِ وَيولِجُ النَّهارَ فِي اللَّيلِ ۚ وَهُوَ عَليمٌ بِذاتِ الصُّدورِSyed V. AhamedHe merges night into day and He merges day into night; And He has complete knowledge of the secrets in the breasts (in the hearts of humans).