You never know what motivates you.
If you're going through hell, keep going.
It's always too early to quit.
Be kind whenever possible. It is always possible.
To know oneself, one should assert oneself.
The wise does at once what the fool does at last.
Do not weep do not wax indignant. Understand.
Expect problems and eat them for breakfast.
Be thine own palace, or the world's thy jail.
Either you run the day or the day runs you.
I think space will be conquered through the mind rather than the clumsy medium of space travel.