If you think you can do it, you can.
What you do today can improve all your tomorrows.
To know oneself, one should assert oneself.
Always desire to learn something useful.
Begin to be now what you will be hereafter.
It's always too early to quit.
If you've got a talent, protect it.
Without hard work, nothing grows but weeds.
Expect problems and eat them for breakfast.
The most effective way to do it, is to do it.
In 1948 I entered the Massachusetts Institute of Technology, undecided between studies of chemistry and physics, but my first year convinced me that physics was more interesting to me.