Jami` at-Tirmidhi Hadith 2448

"What an evil servant is the one who fancies himself and becomes vain forgetting the Most Great, the Most High. What an evil servant is the one who forces and behaves hostility, forgetting the Compeller, the Most High. What an evil servant is the one who is heedless and diverted, forgetting about the graves and the trials. What an evil servant is the one who is violent and tyrannical, forgetting his beginnings or his end. What an evil servant is the one who seeks the world through the religion. What an evil servant is the one who seeks the religion through his desires. What an evil servant is the one who puts all hope in his own zeal. What an evil servant is the worshipper who is misled by his desire. What an evil servant is the one whose aspirations humiliate him."