People have more power than the Yetzer Harah himself.  They have great power to influence a person, keeping him…even from serving Hashem.  The Yetzer Hara [on the other hand] is only given power in a particular world.  His ability does not extend beyond this.  However, man includes all worlds.  There is nothing beyond his ability.  Therefore, man can do more to deter a person from Hashem than the Yetzer Hara himself. ~ R’ Nachman of Breslov zt”l