Here's a quote by someone I admire very much - Dorothy Day - who is considered a saint by many:
We plant seeds that will flower as results in our lives, so best to remove the weeds of anger, avarice, envy and doubt, that peace and abundance may manifest for all.Of course, from a meditative point of view we realize we can't literally remove those weeds but what we can do is choose not to feed them or give them energy. I think what Dorothy Day is on about is that we don't have to justify these things or be defeated by them. She is also talking about the reality of cause and effect. If we allow anger, avarice, envy and doubt to flourish, they will manifest in very damaging ways. We can avoid that by cultivating compassion, lovingkindness, sympathetic joy and equanimity. That way peace and abundance will truly manifest in our lives and in the lives of those we influence.