The ruling on having an objection in the slave's heart regarding enslavement

The questioner:
Regarding enslavement, some Muslims, influenced by the culture of disbelievers, may feel that it is injustice. The question is: What is the ruling on having such a feeling in the slave's heart? Does it harm him if he feels it? And if he speaks about it, what is required of him?

The Shaykh:
It is obligatory for a person to submit to Allah (Glorified and Exalted is He) and not to object to Him. As long as he has not spoken, he is free from blame, for Allah has overlooked for my community mistakes, forgetfulness, and what their souls suggest to them, as long as they do not speak or act. If he finds something in his heart, or a question, or a difficulty regarding some of the rulings of the Shari'ah, he should not speak about it, but submit to Allah and know that what Allah has legislated is the truth, it is wisdom, and it is justice, whether we understand it or not. However, the wisdom in enslavement is apparent, and it is what we mentioned at the beginning of the discussion: that these people, when they disbelieved in Allah and left the worship of Allah (Mighty and Majestic), Allah punished them by making them slaves as a punishment for them. This is an apparent wisdom. Yes.