Things do not happen. Things are made to happen.
Without hard work, nothing grows but weeds.
Begin to be now what you will be hereafter.
I can, therefore I am.
Be thine own palace, or the world's thy jail.
The dog that trots about finds a bone.
Be kind whenever possible. It is always possible.
The wise does at once what the fool does at last.
It's always too early to quit.
Well done is better than well said.
There's a lot of interest from the medical community on how things develop in microgravity, and the hope, later, that is expected to apply to what the changes are in humans as well.