What is the slogan written on the stake?

This sentence comes from "Cooperation between Ancient and Modern Scholars and Literati" written by Zhou in Qing Dynasty. The original text is: People are United, Mount Tai moves. It is difficult to walk with one foot, but it is difficult to sing with one hand. A rising tide lifts all boats, but more firewood and less fire. Multiple heads are better than one. A brick cannot build a wall, and a piece of wood cannot build a house. A fence, three piles, a hero and three gangs. One bamboo pole bends easily, but three hemp ropes are hard to break. A single flower is not spring, and the garden is full of flowers.

A fence, three piles, a hero, three gangs, proverbs. For example, people with superb skills also need help from others.

Interpretation: A fence needs three piles to stand, and a hero needs three people to help him complete the task. For example, people with superb skills also need help from others.