During Lent, especially, we are to reject Satan and all his works, but also all his promises. Since he is the Father of lies, his promises are half truths and destructive promises. We are called to discern between the lies of the Evil One and the truths of the Eternal God. God promises what leads to eternal life with him.  Satan promises what leads to eternal life with him in the fires of hell. On the surface, his promises are enticing. He is like the salesman who tells you the nice things about a used car, but doesn't tell you it has no engine. His promises are facades. Through prayer, fasting and almsgiving during Lent we seek to better our discernment gift, knowing what is of God, of the world, or of Satan. Then, hopefully, we will choose that which is of God. This will make our Lent fruitful.