If you're going through hell, keep going.
Without hard work, nothing grows but weeds.
The wise does at once what the fool does at last.
Do not weep do not wax indignant. Understand.
I can, therefore I am.
Expect problems and eat them for breakfast.
Leap, and the net will appear.
Wherever you are - be all there.
It's always too early to quit.
Things do not happen. Things are made to happen.
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.