Not sure about the original source though. A quick Google comes up with either German, Italian or even Lenin, with varying numbers of wise men.
As an aside, I came across Proverbs 18:2, which I rather like: "A fool takes no pleasure in understanding, but only in expressing his opinion" (or, somewhat more poetic in KJV: "A fool hath no delight in understanding, but that his heart may discover itself").
[1]: In Dutch: https://dbnl.org/tekst/stoe002nede01_01/stoe002nede01_01_062...
1. Let's ensure wise men don't stop to share their wisdom
2. Let's ensure wise men don't stop sharing their wisdom
If you say, "don't stop to do X," that means (roughly), "don't do X." In other words, #1 means the same thing as, "Let's ensure wise men don't share their wisdom." #2 is the one you want. If the amount of multiple negatives is confusing, omit them completely and say, "Let's ensure wise men keep sharing their wisdom."
[1] https://www.quora.com/What-is-the-difference-between-stop-do...
(Disclaimer: I own the complete edition, so not meant as an offense.)