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.

I say, therefore, with reverence and on the authority of the Word of God that God sees your sins no more; He sees the righteousness of Christ upon you. Lay hold of that.
Martyn Lloyd-Jones