A Person Knowingly Denies
Shaykhul-Islām Ibn Taymiyyah رحمه الله stated:
Indeed, a person knows that the truth is with other than him, and with that, he denies it due to his jealousy of him, seeking to be over him, or (evil) desires of the soul. That (evil) desire carries him to transgress against him and reject what he says by all means, while (all the time) he knows in his heart that the truth is with him.