​What is the Purpose of the Yetzer Hara?

The yetzer hara (inclination for evil) is misunderstood. Hashem is all goodness. Therefore, if He made a yetzer hara, it’s a tremendous chesed. But it’s a perilous form of chesed. If you know how to utilize the yetzer hara, you can become great. But if you don’t think about it, you can’t even try to protect yourself, and it’ll conquer you. — Five Minutes a Day