The important thing in life is to have a great aim,
and the determination to attain it.
Someone asking to borrow your stapler or eyeing your lunch again? Tigers can claim more than 200 square miles as territory. What's yours is yours. Don't be afraid to let people know it or be afraid to say no (politely, of course)。 If you do loan something out, set clear expectations of when you want it back.
Some people will never learn anything for this reason, because they understand everything too soon.
Don't wait for ideal circumstances, they will never come, nor for the best opportunities.