It's always too early to quit.
Be gentle to all and stern with yourself.
Know or listen to those who know.
If you think you can do it, you can.
Begin to be now what you will be hereafter.
Go for it now. The future is promised to no one.
Things do not happen. Things are made to happen.
Problems are not stop signs, they are guidelines.
What you do today can improve all your tomorrows.
The dog that trots about finds a bone.
The most useful form of time travel would be to go back a year or two and rectify the mistakes we made.