Si.. How can I phrase or quote the below sentence in a better meaningful way
"You have to open up about yourself first (like introduce self or answer the question asked by the other person or to know him first) so that the other person is comfortable with talking to him about his issues or personal life."
Much like talking to a therapist. The patient wants to know about the doctor (anything). Why I refer the therapist and the patient here as an example, is because the other person is the one who is offering the help and the patient can discuss anything with the therapist.
Edit: I am really sorry for the confusion. Seems like everyone is taking it in the wrong way. What I actually want is to replace the above highlighted sentence with one short sentence like a quote in a polite way. Like "Open oneself before asking" would this be the appropriate one or is there any other phrase or quote.