Summary of The 48 Laws of Power by Robert Greene

The snake: this person will not show any reaction if you step on him, but he will not forget. He will wait patiently and will exact his revenge when you least expect it. Be careful to make him your ally, or if you make him an enemy, defeat him completely.

The suspicious: this person sees the worst in everyone and thinks everyone is after him. He is not as dangerous as the first two types are, since you can turn his paranoia against others.

The prideful: if you inadvertently pierce the ego of an arrogant individual, you will know right away. He will pursue vengeance with abandon. You may want to cut your losses and abandon the effort.

If you are honest in your first interaction with someone, they will give you the benefit of the doubt when you later deceive them.