Matthew 13

The Savior continued to teach parable in what I see would be the growth of the Church, especially in the latter days -

"...The kingdom of heaven is like to a grain of mustard seed, which a man took, and sowed in his field:
32 Which indeed is the least of all seeds: but when it is grown, it is the greatest among herbs, and becometh a tree, so that the birds of the air come and lodge in the branches thereof."  (New Testament | Matthew 13:31 - 32)

The Prophet Joseph Smith taught that the "birds" were angels or God's messengers.  And then -

"Another parable spake he unto them; The kingdom of heaven is like unto leaven, which a woman took, and hid in three measures of meal, till the whole was leavened."  (New Testament | Matthew 13:33)

I am not necessarily sure why He used the "three measures of meal".  But my thoughts are that the meal was in the beginning of the growth of the Church.  It three testimonies of three witnesses were given upon the which the Church grew.

In fullfillment of prophecy -

"All these things spake Jesus unto the multitude in parables; and without a parable spake he not unto them:
35 That it might be fulfilled which was spoken by the prophet, saying, I will open my mouth in parables; I will utter things which have been kept secret from the foundation of the world."  (New Testament | Matthew 13:34 - 35)

Of greatest importance, as the Savior explained these parable to His disciples -

"Jesus saith unto them, Have ye understood all these things?..."  (New Testament | Matthew 13:51)

Elder Boyd K. Packer has taught that -

"...true doctrine understood changes attitudes and behaviors..."