If you can dream it, you can do it.
If you think you can do it, you can.
Know or listen to those who know.
It's always too early to quit.
You never know what motivates you.
Be gentle to all and stern with yourself.
Always desire to learn something useful.
Without hard work, nothing grows but weeds.
I can, therefore I am.
Do not weep do not wax indignant. Understand.
I'm someone who's done the opposite of whatever the received wisdom is, to keep your career going into your 50s.