Never complain and never explain.
Go for it now. The future is promised to no one.
Without hard work, nothing grows but weeds.
It's always too early to quit.
Always desire to learn something useful.
To know oneself, one should assert oneself.
Begin to be now what you will be hereafter.
Know or listen to those who know.
If you're going through hell, keep going.
What you do today can improve all your tomorrows.
I believe you'll develop speed via strength work which includes hill running, either repeats, or running hilly courses as the Kenyans do on a steady basis.