Words can be meaningless. If they are used in such a way that no sharp conclusions can be drawn.
Richard P. FeynmanA scientist is never certain. ... We absolutely must leave room for doubt or there is no progress and there is no learning.
Richard P. FeynmanIf you keep proving stuff that others have done, getting confidence, increasing the complexities of your solutions - for the fun of it - then one day you'll turn around and discover that nobody actually did that one! And that's the way to become a computer scientist.
Richard P. Feynman