Musar for Shabbat 42:12

As for those with no desire to accept the responsibility on themselves, reasoning that the responsibility is more weight than the worker can handle, this is a mistake. We can bring a proof against this, in what we find in the Torah, that Moshe our master requested helpers from The Holy One Blessed is He, saying "I am not able to carry this burden alone etc." And The Holy One Blessed is He responded to him "Gather for me seventy men… and I will draw from the spirit which is on you etc." This is perplexing. Was it not his intention in his request that The Holy One Blessed is He give him helpers, as if to say, give additional strength from what he already has, and [in Hashem's response] what did he give him!? It is possible to answer that he supplied him seventy men, but he did not supply him with seventy additional units of power on top of his own strengths, because he drew from his Moshe's spirit and gave it to them!? What is this situation comparable to? To a vessel, compartmentalized by placing a second tube inside. The vessel is not widened by doing this. Similarly with this 'addition', it did not bring any more qualities, rather it is the measurement and weight that Moshe had on his own, just now it is made amongst seventy men as well, without increase. And we find that the power afforded them comes about through retraction from Moshe, as it writes "and I will draw…", even though there are those who say it is similar to one candle lighting another (Sifri), in any event, this is in the sense of a commandment like we find by the Chanukah lights, and he is puzzled, what was the intention of his question to add in strength?