Live in "Day tight compartments"...a lesson by Dale Carnegie

In the spring of 1871, a young man picked up a book and read twenty-one words that had a profound effect on his future. A medical student at the Montreal General Hospital, he was worried about passing the final examination, worried about what to do,where to go, how to build up a practice, how to make a living.
The twenty-one words that this young medical student read in 1871 helped him to become the most famous physician of his generation. He organised the world-famous Johns Hopkins School of Medicine. He became Regius Professor of Medicine at Oxford the highest honour that can be bestowed upon any medical man in the British Empire.He was knighted by the King of England. When he died, two huge volumes containing 1,466 pages were required to tell the story of his life.

His name was Sir William Osier-

" each one of you live with ''day-tight compartments' Touch a button and hear, at every level of your life, the iron doors shutting out the Past-the dead yesterdays. Touch another and shut off, with a metal curtain, the Future -the unborn tomorrows. Then you are safe-safe for today!.Shut off the past!Let the dead past bury its dead. ... Shut out the yesterdays which have lighted fools the way to dusty death. ... The load of tomorrow, added to that of yesterday, carried today, makes the strongest falter. Shut off the future as tightly as the past. ... The future is today. ... There is no tomorrow. The day of man's salvation is now "