Augustine of Hippo

So those flourishing, wicked people are like grass, sprouting in winter, drying up in summer. Take care that you, though, fix your roots in the Word of God, which abides forever, and that you are a tree living in a hidden way. "For you are dead, and your life is hidden with Christ in God." That is where your root is; that is where you are alive. That, you see, is where you have placed your hope.… So do not let the winter time get you down. In the winter many prolific fruit trees lack the ornament of leaves and without the grace of fruit are like withered trees, and yet they are not in fact withered. When the grass is flourishing, they haven't even got leaves … the summer is the judge … the sun of justice is the judge.