The great enemy of ...

The great enemy of achievement is a schedule already full.
The great enemy of achievement is a schedule already full.

More phrases

Being self-made is a state of mind, and once you put that mentality to work, your success will come.
 Dave East
A lot of people change for good. Some people just fall off. Just trying to progress in anything, no matter what you're doing, I feel like any progression you make... some people aren't gonna be around you that were around you.
 Dave East
There are no secrets to success. It is the result of preparation, hard work, and learning from failure.
You have to have the service mentality in the sense that you subjugate your own ego, and you subjugate a large part of your own life to really helping other people, being successful on their behalf.
 Herb Kelleher
Success consists of going from failure to failure without loss of enthusiasm.

Quotes from the same author

What is a mom but the sunshine of our days and the north star of our nights.
Mom - the person most likely to write an autobiography and never mention herself.
One of the great logical puzzles is how a woman is always like her mother but never like her sister.
U.S. Internal Revenue Service: an agency modeled after the revenue raising concepts of the 19th century economist, Jesse James.
The lesson of Good Friday is to never lose hope — or at least give it 48 hours.