A few of my favourite lines...

When the spirit rises and commands
The gods are willing to obey!
- Ella Wheeler

And this:
The heights by great men reached and kept
Were not attained by sudden flight
They, while their companions slept
Were toiling upwards in the night
- Wordsworth

And this:
Live like you were to die tomorrow;
Learn like you were to live forever
- Gandhi

How some things enthuse me!!