What do you mean you can't do it with a small number of people? It is said to be from Zeng Guofan's famous saying. The first half of the sentence is: benefits can be shared but not exclusive, and plans can be less but not made public. Before you do something, you can consult a few people who understand it, but you can't listen to many opinions.

It means that you must avoid consulting too much before you do something. Otherwise, you will make things worse, because it is difficult to decide.

This sentence may be difficult for China people to understand because of the break between modern China culture and China classical culture. In fact, it is a widely accepted concept in China traditional culture. Modern people often think it is beneficial to listen to opinions widely. Actually, it is not. Because the success or failure of a thing depends not only on the understanding of it, but also on the determination of the implementer. If your determination wavers, you can't do it.

In the Analects of Confucius, "think twice before you act" actually means this. In fact, the ancients were far smarter than people now think.