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qul ʾin tukhfū mā fī ṣudūrikum ʾaw tubdūhu yaʿlamhu llāhu wa-yaʿlamu mā fī s-samāwāti wa-mā fī l-ʾarḍi wa-llāhu ʿalā kulli shayʾin qadīrun
Say, ‘Whether you hide what is in your hearts or disclose it, Allah knows it, and He knows whatever there is in the heavens and whatever there is in the earth; and Allah has power over all things.’
— Ali Quli Qarai
Surah 'Ali-Imran, Verse 29
29. "Say: ' Whether you hide what is in your hearts, or manifest it, Allah knows it, and (also) He knows whatever is in the heavens and whatever is in the earth, and Allah is All-Powerful over all things '."
Next to the verse of concealment of Faith, the above mentioned holy verse, maybe, refers to the idea that Muslims should never communicate with disbelievers under the shelter of concealment of Faith, where the Lord knows all decisions and intentions.
Explanation
1. This verse is a warning to those who try to communicate with the disbelievers under the excuse of concealment of Faith.
2. Allah is aware of whatever deed we do.
3. The Lord is aware even of our intentions.
4. Allah's knowledge encompasses the things hidden and the things manifest similarly. He knows whatever is in the earth and whatever is in the heavens.
5. Allah is both knower of thoughts of human beings and is All-Powerful over all things. That is, in a moment, He is able to make infamous all those who do evil.
6. What can be concealed from the One Who is Omnipotent and knows all the secrets of heavens?