From Grothendieck, I have also learned not to take glory in the difficulty of a proof: difficulty means we have not understood. The idea is to be able to paint a landscape in which the proof is obvious.

— Pierre Deligne

我从格罗滕迪克那里学到，证明切勿以艰难高深为荣，艰难高深意味着我们未能洞悉本质。至高境界是勾勒出一幅图景，一切都自然而然、不言而喻。

— 皮埃尔·德利涅