Problems are not stop signs, they are guidelines.
Things do not happen. Things are made to happen.
Expect problems and eat them for breakfast.
The most effective way to do it, is to do it.
The dog that trots about finds a bone.
Well done is better than well said.
If you think you can do it, you can.
If you're going through hell, keep going.
What you do today can improve all your tomorrows.
If you can dream it, you can do it.
That is a secondary teacher conception - the writer as an observer.