That's true friendship.
Shakespeare.
The more help you get, the less help you lose.
A fence, three piles, a hero, three gangs. A drop of water will never dry up until it is thrown into the sea. Only when a person integrates himself into the collective cause can he be most powerful. -Lei Feng
If you can do your best, you will be invincible; If you can use all your wisdom, you will be fearless of saints. -Three Kingdoms. Sun quan
Five people unite with a tiger, ten people unite with Yi Long, and a hundred people unite as Mount Tai. -Deng Zhongxia
People together can do things that a single person can't do; Wisdom+hands+strength together, is almost omnipotent. -May Webster