Mastery of Thyself

 
It is not the mountain we conquer but ourselves.
- Edmund Hillary

It is better to conquer yourself
than to win a thousand battles.
Then the victory is yours.
It cannot be taken from you,
not by angels or by demons, heaven or hell.
- The Buddha

I learned that courage was not the absence of fear,
but the triumph over it.
The brave man is not he who does not feel afraid,
but he who conquers that fear.
- Nelson Mandela

I believe that anyone can conquer fear
by doing the things he fears to do,
provided he keeps doing them until he gets
a record of successful experience behind him.
- Eleanor Roosevelt

Further reading:  Balance Caution With Courage

Don't Try to Please Everyone

Play to win, but be a good loser