Real knowledge is to know the extent on one’s ignorance. – Confucius

The more sand that has escaped from the hourglass of our life, the clearer we should see through it. – Jean Paul

How many have said I wish I knew then what I know now?  Well, you would have lived life differently and not have learned what you know now.

The known unknowns and the unknown unknowns are the mysteries of life to learn.  Don’t be blinded by arrogance to think that you know everything.   Always try to learn something, anything no matter how little and you will never be disappointed.

Also, appreciate what you have for today.  You don’t know what tomorrow brings, or how many tomorrow’s you have.  It’s easy to be dissatisfied when you are selfish or self-centered.  Try looking at things from anothers point of view, especially their view of you and see if your thinking is clear.