law 10

contagious: avoid the unhappy and the unlucky

Bad information in brain will  be spread such as a computer. You have 5 input ports: touch, tasty, smell, hear and vision. Keep your brain strong and healthy to work together with your team.
Bad information includes negative information such as madness. They damage their brains and others brains paying attention to such things. Remember: television only shows what you want.

When dealing with persons take in account to mirror neurons cells. You can copy the others in unconscious way, without knowing nothing about it. It is a feature from monkeys. 

Stoicism teaches you to be together with persons who get higher you.