Dietrich Bonhoeffer, from Letters and Papers from Prison, 204-205:

It is in just such times that we should make an effort to remember in our prayers how much we have to be thankful for.  Above all, we should never allow ourselves to be consumed by the present moment, but should foster that calmness that comes from noble thoughts, and measure everything by them.  The fact that most people cannot do this is what makes it so difficult to bear with them.  It is weakness rather than wickedness that perverts people and drags us down, and it needs profound sympathy to put up with that.  But all the time God still reigns in heaven.