What does the dhamma need in order to spread ? And how can we help it?

[Metaphor]

There was a similar discussion on related questions awhile back:

Proselytizing

Recently on a visit to my weekend condo at the beach I ran into the couple who own the unit next to mine. They previously knew that I was going through a difficult time in my life and, in a friendly gesture, asked me in for a drink (they imbibed alcohol, I had club soda). In the course of the discussion I mentioned that my newfound Buddhist practice has helped me get through a rough period in my life. The couple used this information as an opportunity to preach the gospel to me (for those unacc…