In the scriptures, the ear is often used as a symbol of a person’s ability to hear and understand the things of God.
Thanks to Elder Greco, this phrase has been instilled within me recently; as whenever I don't understand what he is saying he repeats that very phrase; "he who hath ears, let him hear," to me. The savior used these very words in Matthew 13 after giving the parable of the sower.
When asked upon by his apostles as to why he spoke in parables "he answered and said unto them, Because it is given unto you to know the mysteries of the kingdom of heaven, but to them it is not given...