Yesterday is gone. The other day we should not worry about is tomorrow, with its possible adversaries, its burdens, its large promise and poor performance. Tomorrow's sun will rise, either in splendor or behind a mask of clouds - but it will rise. Until it does, we have no stake in tomorrow, for it is yet unborn. This leaves only one day - today.
Any man can fight the battles of just one day.
It is not the experience of today that drives men mad - it is remorse or bitterness for something which happened yesterday and the dread of what tomorrow may bring.