If you can dream it, you can do it.
If you're going through hell, keep going.
Well done is better than well said.
By failing to prepare, you are preparing to fail.
If you think you can do it, you can.
Expect problems and eat them for breakfast.
Know or listen to those who know.
Be gentle to all and stern with yourself.
To know oneself, one should assert oneself.
Problems are not stop signs, they are guidelines.
If you decide to design your own language, there are thousands of sort of amateur language designer pitfalls.