Charles Spurgeon
When preaching and private talk are not available, you need to have a tract ready. Get good striking tracts or none at all. But a touching gospel tract may be the seed of eternal life. Therefore do not go out without your tracts.

Humility, not pride, should be what motivates us to share the gospel with unbelievers. For in sharing the gospel with those who are perishing, we are reminded that we were once perishing ourselves.
Darrell Harrison