Musannaf Ibn Abi Shaybah

Hazrat Sufyan (may Allah have mercy on him) says that renunciation (zuhd) in the world is by reducing hopes, not by wearing woolen clothes. And it is also mentioned that Awza'i (may Allah have mercy on him) used to say that renunciation in the world is to abandon seeking praise. He used to say: Act for the Hereafter, do not intend that people will praise you for your actions. And Zuhri (may Allah have mercy on him) used to say that renunciation in the world remains as long as the unlawful does not overcome your patience and the lawful does not overcome your gratitude.