Quote by Daffy Duck

Oh you can do it all the time

— MGMT

If you do it once, you'll do it again!

— Hellz__Angel

You can never do more than you know.

— Anonymous

And if you do all you can, that's all you can ever do.

— Warren Rudman

But at the same time you can't...

— Angela Davis

I can do only one thing at a time, but I can avoid doing many things simultaneously.

— Ashleigh Brilliant

If you give yourself to your task at once, you won't have to do it twice.

— David Seabury

Don't say I can't before you try it many times

— Mabor Maker Kulang

Most of us can easily do two things at once; what's all but impossible is to do one thing at once.

— Mignon McLaughlin

Won't you do it and do it one time?

— Sugarland

They say you can't do it, but sometimes it doesn't always work.

— Casey Stengel

To some degree. I know I couldn't do it anymore.

— Chuck Daly