Once upon a time a very strong woodcutter ask for a job with a timber merchant, and he got it. The pay was really good and so were the work conditions. For that reason, the woodcutter was determined to do his best.
His boss gave him an axe and showed him the area where he was supposed to work.
The first day, the woodcutter brought in 18 trees.
"Congratulations," the boss said. "go on that way!"
Very motivated for the boss' words, the woodcutter tried harder the next day, but he could only bring in 15 trees. The third day he tried even harder, but he only could bring in 10 trees. Day after day he was bringing in lesser and lesser trees.
"I must be losing my strength", the woodcutter thought. He went to the boss and apologized, saying that he could not understand what was going on.
"When was the last time you sharpened your axe?" the boss asked.
"Sharpen...? I had no time to sharpen my axe. I have been very busy trying to cut trees..."
~ Stephen Covey - 7 Habits of Highly Effective People
"The key is not to prioritize your schedule, but to schedule your priorities."
~ Stephen Covey