Whether you hide your word and thought or make it known, behold, He is the Knower of what is in the hearts. ('Qaul' = Word = Saying = Utterance. It also signifies thought, opinion, belief and idea)
Whether you speak in secret or aloud, surely He is aware of all that is in the breasts
Dr. Munir Munshey
(Little does it matter whether you) whisper your words in secret, or shout them out aloud! He is indeed aware of everything, (every thought) that passes through the heart
Dr. Kamal Omar
And whether you keep your talk secret or you make it loud — truly, He is All-Knower about the state of the chests
(Mankind!) Whether you conceal your thoughts or speak them openly (it makes little difference to Him) for He knows well the innermost secrets of the hearts
Conceal your thoughts or reveal them! Indeed, He is Aleem of what is in the hearts (consciousness) as the absolute essence therein.
Al-muntakhab fi tafsir al-Qur'an al-Karim
Whether you converse secretly and whisper the spoken words under your breath or you utter them loudly, He is well acquainted with all that is being said, and with all that you suggest secretly to the mind, and with all that the bosoms store of thoughts and feelings and all that they forge