“Sufficient unto the day…”

[My ideal is] to do the day’s work well and not to bother about tomorrow. You may say that is not a satisfactory ideal. It is; and there is not one which the student can carry with him into practice with greater effect. To it more than anything else I owe whatever success I have had—to this power of settling down to the day’s work and trying to do it well to the best of my ability, and letting the future take care of itself.

—William Osler