"It is impossible to be a mathematician without being a poet in soul."
Sofia Kovalevskaya 1895
If a child is throwing rocks on the playground, let's give all the other kids rocks to throw at the kid throwing rocks. After all, the best way to stop a kid throwing rocks from hurting other kids is to give the other kids rocks to hurt him with.
Yuanwu said to Miaoxi:
In whatever you do, you should be careful about the ending and the beginning. What is done well inevitably turns out well, and what starts well finishes well. If you are as careful of the end as of the beginning, then there will be no failure.
As the ancient saying goes, "What a pity that the robe yet unfinished is turned into a shirt. The hundred-mile journey is still halfway at ninety." This expresses lament at having a beginning without an end. So it is said, "Anyone can begin something, but few can bring it to a conclusion."