Tomorrow's burden

It has been well said that no one ever sank under the burden of the
day. It is when tomorrow's burden is added to the burden of today
that the weight is more than a person can bear. Never load
yourselves so, my friends. If you find yourselves so loaded, at
least remember this: it is your own doing, not God's. He begs you
to leave the future to Him and mind the present.
- George MacDonald (1824-1905), "Annals of a Quiet
Neighbourhood," v. I