Take advantage of this human ...

Take advantage of this human boat; 
Free yourself from sorrow\'s mighty stream! 
This vessel will be later hard to find.
The time that you have now, you fool, is not for sleep!
Take advantage of this human boat; Free yourself from sorrow's mighty stream! This vessel will be later hard to find. The time that you have now, you fool, is not for sleep!
 Shantideva

More phrases

If one does not know to which port one is sailing, no wind is favorable.
What a distressing contrast there is between the radiant intelligence of the child and the feeble mentality of the average adult.
We are masters of the unsaid words, but slaves of those we let slip out.
I have always found that mercy bears richer fruits than strict justice.
A lie gets halfway around the world before the truth has a chance to get its pants on.

Quotes from the same author

Penetrative insight joined with calm abiding utterly eradicates afflicted states.
 Shantideva
Self-confidence should be applied to wholesome actions, Overcoming of delusions and my ability to overcome them. Thinking, 'I alone shall do it' Is the self-confidence of action.
 Shantideva
All the happiness there is in this world Arises from wishing others to be happy. And all the suffering there is in this world Arises from wishing oneself to be happy.
 Shantideva
He who doesn't get rid of the I won't be able to avoid suffering the same way that someone who doesn't get apart from fire can't avoid being burn.
 Shantideva
Suffering also has its worth. Through sorrow, pride is driven out And pity felt for those who wander in samsara; Evil is avoided, goodness seems delightful.
 Shantideva