Be thine own palace, or the world's thy jail.
Without hard work, nothing grows but weeds.
If you can dream it, you can do it.
It's always too early to quit.
Leap, and the net will appear.
The dog that trots about finds a bone.
Be kind whenever possible. It is always possible.
By failing to prepare, you are preparing to fail.
If you're going through hell, keep going.
Go for it now. The future is promised to no one.
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.