A fantastic dose of perspective from the past:

In spite of failures which I lament, of errors which I now see and acknowledge, or of the present aspect of affairs, do I despair the future? The truth is this: the march of Providence is so slow, our desires so impatient, the work of progress is so immense, and our means of aiding it so feeble, the life of humanity is so long, that of the individual so brief, that we often see only the ebb of the advancing wave and are thus discouraged. It is history that teaches us to hope. —Robert E. Lee

Give ear, O my people, to my law: incline your ears to the words of my mouth. I will open my mouth in a parable; I will utter dark sayings of old; which we have heard and known, and our fathers have told us. We will not hide them from their children, shewing to the generation to come the praises of the LORD, and his strength, and his wonderful works that he hath done. —Psalm 78:1-4