Help!!!

I need to find meanings of some quotes by some author poet...Can anyone help me?? How do I get them or is there anyone who is good at explaining the meanings behind these quotes??

1. Education is the most powerful weapon which you can use to change the world.

2. There is no passion to be found playing small- in settling for a life that is less than the one you are capable of living.

3. 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.

4. It is better to lead from behind and to put others in front, especially when you celebrate victory when nice things occur. You take the front line when there is danger. Then the people will appreciate your leadership.

(this 4 are by Nelson Mandela)

5. I submit that an individual who breaks the law that conscience tells him is unjust and willingly accepts the penalty by staying in jail arouse the conscience of community over its justice, is in reality expressing the very highest respect for law.
-by Martin Luther King Jr

The following 2 quotes are from Barack Obama

6. Change will not come if we wait for some other person or time. We are the ones we've been waiting for.

7. We need to steer clear of this poverty of ambition, where people want to drive fancy cars and wear nice clothes and live in nice houses but don't want to work hard to accomplish these things. Everyone should try to realise their full potential.

8. My mother said I must always be intolerant of ignorance but understanding of illiteracy. That some people, unable to go to school, were more educated and more intelligent than college professors.

9. We allow our ignorance to prevail upon us and make us think we can survive alone in patches, alone in groups, alone in races, even alone in genders.

(These last 2 ones are by Maya Angelou)

Please email me at angelheart_nic@hotmail.com if anyone of you who's reading this knows the deeper meanings of these quotes. Thank you :D