Be gentle to all and stern with yourself.
Be thine own palace, or the world's thy jail.
Begin to be now what you will be hereafter.
I can, therefore I am.
Know or listen to those who know.
Without hard work, nothing grows but weeds.
If you've got a talent, protect it.
Never complain and never explain.
By failing to prepare, you are preparing to fail.
Be kind whenever possible. It is always possible.
There are simply more young people than there ever were. You get this feeling of strength. Also, large numbers can be a drawback, making it difficult to lose one's anonymity.
Teenagers today are more free to be themselves and to accept themselves.