"Do or do not - there is no try" (Yoda)
I wonder if G Altshuller instead would have said:
"Do and do not - there is no try"
To be able to "do and don't do" you need to solve a contradiction. And solving contradictions is a main theme of TRIZ.
(Click TRIZ to see what Wikipedia says. And you can find more about Altshuller at various sites - why not start here. )