This is a great post by Rachel Held Evans discussing 2 approaches to evangelism; direct questions to strangers requiring a direct response, verses planting seeds in peoples lives and journeying with them. I love her quote:
Maybe “witnessing” is about the choice we have to plant seeds of unkindness, hurry, hate, and greed in one another’s lives, or to plant seeds of love, joy, peace, patience, kindness, goodness, faithfulness and self-control. Whether it’s in our closest relationships or our brief encounters with strangers, we always have that choice—to bring life or to bring death, to bring an agenda or to bring love, to bring a product or to bring Jesus.
Read and enjoy…
http://rachelheldevans.com/blog/why-i-dont-witness-to-people-on-airplanes