The best advice I ever came across on the subject of concentration is: Wherever you are, be there.
One of the early signs of sophistication is not giving way to all inclinations but rather sending your emotions to school so they will learn how to behave.
Success is not so much what we have as it is what we are.
Life, in all its uniqueness, would not be life without the negatives and the positives.
Be fascinated instead of frustrated.
The greatest reward in becoming a millionaire is not the amount of money that you earn. It is the kind of person that you have to become to become a millionaire in the first place.