Bible Verses About Seed: Preaching the gospel

And he spake to them many things in parables, saying, Behold, the sower went forth to sow;

which indeed is less than all seeds; but when it is grown, it is greater than the herbs, and becometh a tree, so that the birds of the heaven come and lodge in the branches thereof.

If we sowed unto you spiritual things, is it a great matter if we shall reap your carnal things?