Let's go back to the ABC's and see what G-d wrote in the Torah about the Yetzer Hara. When Kayin was not willing to sacrifice to G-d as much as Hevel was, G-d turned away from his offering. Kayin felt rejected and so G-d said to him:"Why are you sad? If you will do better you will be accepted, and if not, your sins will crouch for you on the entrance of your grave (meaning, that when you die you will be paid back for your sins). " Ve'elecha Teshukaso, Ve'ata Timshal Bo' - "And the evil inclination's desire is to make you stumble, and you shall rule over him".
The Zohar gives a parable of a king who wanted to test his son's loyalty, so he paid for a prostitute to try to entice his son. The prostitute will do her best to make the king's son stumble, but deep down she really wants that the king's son should refuse her, for she too is a servant of the king and wants the king to truly be happy.
It is helpful to remember this parable, and to realize that the Yetzer Hara is also really a servant of Hashem. Deep down, he is happy when you refuse his destructive seducing! Realize that life is all a test of our loyalty, and of how much we are really willing to sacrifice for G-d.