For the field is white.

In D&C 33:3 where it talks about the field being white and ready to harvest, this mentions that there is work to be done and that the time of the harvest has come. The time to gather in the saints has come. When I think of being a missionary I picture myself going into a field with a basket and a scythe and gathering in those who are ready or ripe. Just the same as going out into the mission field and finding those that are "ripe" or ready to hear the restored gospel of Jesus Christ and to bring them unto His store house.