“ You should learn to think of one thing at a time with all the power of your mind. Your whole attention should be there. Doing things in a lackadaisical way leads to failure and misery. ”
Source: Man's Eternal Quest, page 391
Similar Quotes
If our joy is about being better than someone else, it is not success; it is sickness. To reap the benefits of someone else's failure is a tragic way to live. 
The true measure of success is how many times you can bounce back from failure. 
Life is like topography... There are summits of happiness and success, flat stretches of boring routine, and valleys of frustration and failure. 
If you try to give up something, it will rule your mind. But, if you find something deeper in life, the less significant will just fall off 
Do not let arrogance go to your head and despair to your heart; do not let compliments go to your head and criticisms to your heart; do not let success go to your head and failure to your heart. 
When you take risks you learn that there will be times when you succeed and there will be times when you fail, and both are equally important.