From: Matthew 13:44-46
The Hidden Treasure; The Pearl
(Jesus said to His disciples,)  "The Kingdom of Heaven is like treasure hidden in a field, which a man found and covered up; then in his joy he goes and sells all that he has and buys that field.
 "Again, the Kingdom of Heaven is like a merchant in search of fine pearls,  who, on finding one pearl of great value, went and sold all that he had and bought it."
44-46. In these two parables Jesus shows the supreme value of the Kingdom of Heaven, and the attitude people need if they are to attain it. The parables are very alike, but it is interesting to note the differences: the treasure means abundance of gifts; the pearl indicates the beauty of the Kingdom. The treasure is something stumbled upon; the pearl, the result of a lengthy search; but in both instances the finder is filled with joy. Faith, vocation, true wisdom, desire for Heaven, are things which sometimes are discovered suddenly and unexpectedly, and sometimes after much searching (cf. St. Gregory the Great, "In Evangelia Homilae", 11). However, the man's attitude is the same in both parables and is described in the same terms: "he goes and sells all that he has and buys it": detachment, generosity, is indispensable for obtaining the treasure.
"Anyone who understands the Kingdom which Christ proposes realizes that it is worth staking everything to obtain it [...]. The Kingdom of Heaven is difficult to win. No one can be sure of achieving it, but the humble cry of a repentant man can open wide its doors" ([St] J. Escriva, "Christ Is Passing By", 180).
Source: "The Navarre Bible: Text and Commentaries". Biblical text taken from the Revised Standard Version and New Vulgate. Commentaries made by members of the Faculty of Theology of the University of Navarre, Spain. Published by Four Courts Press, Kill Lane, Blackrock, Co. Dublin, Ireland. Reprinted with permission from Four Courts Press and Scepter Publishers, the U.S. publisher.