Of all the reasons I’ve ever heard not to put something off, my favorite is this: If you feel good enough to do the thing now, seize that opportunity. You might not have it later.
We are subject to many forces we can’t control. Our ability to predict the future generally leans only on the ones we can. You look at your calendar and see that you have time tomorrow to complete that project, so you decide to do it then instead of now. But your calendar can’t tell you if you’ll feel sick, or if your car will break down, or if any of a hundred other little emergencies will daunt you.
If you have the health of body and mind to do the thing now – especially if it’s a thing you want to do! – then seize that opportunity. You never know what misfortunes you may grapple with tomorrow.
The Opportunity Machine 