JC - Chapter 19

Mark recorded the parable -

"So is the kingdom of God, as if a man should cast seed into the ground;
27 And should sleep, and rise night and day, and the seed should spring and grow up, he knoweth not how.
28 For the earth bringeth forth fruit of herself; first the blade, then the ear, after that the full corn in the ear.
29 But when the fruit is brought forth, immediately he putteth in the sickle, because the harvest is come."  (New Testament | Mark 4:26 - 29)

Elder Talmage added the commentary -

"In this story we find effectively illustrated the fact of the vitality of the seed of truth, though the secret processes of its growth be a mystery to all save God alone. A man having planted seed must needs leave it alone. He may tend the field, removing weeds, protecting the plants as best he may, but the growth itself is dependent upon conditions and forces beyond his power to ultimately control. Though it were Paul who planted and Apollos who watered, none but God could insure the increase. The one who sowed may go about his other affairs, for the field does not demand continuous or exclusive attention; nevertheless, under the influences of sunshine and shower, of breeze and dew, the blade develops, then the ear, and in due time the full corn in the ear. When the grain is ripe the man gladly harvests his crop.

The sower in this story is the authorized preacher of the word of God; he implants the seed of the gospel in the hearts of men, knowing not what the issue shall be. Passing on to similar or other ministry elsewhere, attending to his appointed duties in other fields, he, with faith and hope, leaves with God the result of his planting. In the harvest of souls converted through his labor, he is enriched and made to rejoice.  This parable was probably directed more particularly to the apostles and the most devoted of the other disciples, rather than to the multitude at large; the lesson is one for teachers, for workers in the Lord’s fields, for the chosen sowers and reapers. It is of perennial value, as truly applicable today as when first spoken. Let the seed be sown, even though the sower be straightway called to other fields or other duties; in the gladsome harvest he shall find his recompense."

This parable and commentary provides a great deal of counsel for priesthood leaders.