Be gentle to all and stern with yourself.
I can, therefore I am.
By failing to prepare, you are preparing to fail.
Only the educated are free.
The wise does at once what the fool does at last.
Never complain and never explain.
The dog that trots about finds a bone.
Begin to be now what you will be hereafter.
You never know what motivates you.
It's always too early to quit.
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.