How can a student of knowledge be absolved if an evil occurs in the land, knowing that the ruler does not accept it?

Question:
May Allah reward you, Honorable Shaykh. This questioner says: We are students of knowledge, beginners, or common people. How can we be absolved if an evil occurs in the land, knowing that the ruler does not accept us? We ask for clarification.

Answer:
If you denounce it with your tongues, advise, and preach to the sinners, that is sufficient for you to be absolved. [The Prophet (peace and blessings be upon him) said:] "Whoever among you sees an evil, let him change it with his hand; if he cannot, then with his tongue." And if the ruler prevents you from dealing with it, you are excused. But advise; no one prevents you from advising, no one prevents you from preaching, no one prevents you from this. If you employ wisdom and leave off violence and harshness, no one prevents you. Yes.