These days, there are many theories about behavior patterns proposed by as many psychologists. The person, however, is larger than behavior and trait. The person defies any pattern, because he defies classification. To know a person, one has to get involved with him. One has to walk with him and share his experiences.
Involvement is a two-way process.
We cannot share the experiences of an Other if he closes himself from us. Neither can we force ourselves on him. Involvement can only happen in the context of a relationship. The person is the access to truth. But it doesn't mean that the person is only a means to truth.