Very often one meets a person whose contact makes one restless, nervous. The reason is that that person is not restful, not tranquil, and it is not easy to remain calm and to keep one's tranquillity in the presence of a restless, agitated person. The teaching of Christ is, "Resist not evil", and that means, "Respond not to the troubled condition of a restless person." It is just like partaking of the fire which will burn one.