What does it mean to lose face and face, but in the end it's unreliable?

There is a saying in fortune telling that "it is never reliable to gain face but lose face". If you draw a sign, the poem is full of good words "success, bright future", and fortune tellers usually add this sentence when they cancel the sign. Go ahead, "... not necessarily healthy, afraid of future trouble" and so on. As far as I know, this is to deal with the explanation of lottery "in case it doesn't succeed"