Be kind whenever possible. It is always possible.
Begin to be now what you will be hereafter.
Be gentle to all and stern with yourself.
What you do today can improve all your tomorrows.
The dog that trots about finds a bone.
It's always too early to quit.
To know oneself, one should assert oneself.
The secret of getting ahead is getting started.
Leap, and the net will appear.
By failing to prepare, you are preparing to fail.
The frontiers of knowledge in the various fields of our subject are expanding at such a rate that, work as hard as one can, one finds oneself further and further away from an understanding of the whole.