I like the analogy, jazakAllah khayran. ----- Is there a difference in the way one should approach: a person who has already shown interest or in whom you've noticed an open door - ready to talk (and we listen); and people who are unfamiliar to us, people we go to in order to invite or speak or talk to about Islam (in hopes that they listen)? Where one is like sales the other may be like marketing - requiring different approaches, energies and temperaments - both valuable and necessary. If so, then we can imagine room for dawah work of any Muslim/ah for anyone/everyone - across situations/possibilities/temperaments etc. etc.