Church Fathers on Matthew 13:45

The Gospel preaching not only offers manifold gain as a treasure, but is precious as a pearl; wherefore after the parable concerning the treasure, He gives that concerning the pearl. And in preaching, two things are required, namely, to be detached from the business of this life, and to be watchful, which are denoted by this merchant- man.

By the goodly pearls may be understood the Law and the Prophets. Hear then Marcion and Manichaeus; the good pearls are the Law and the Prophets. One pearl, the most precious of all, is the knowledge of the Saviour and the sacrament of His passion and resurrection, which when the merchantman has found, like Paul the Apostle, he straightway despises all the mysteries of the Law and the Prophets and the old observances in which he had lived blameless, counting them as dung that…

Or by the pearl of price is to be understood the sweetness of the heavenly kingdom, which, he that hath found it, selleth all and buyeth. For he that, as far as is permitted, has had perfect knowledge of the sweetness of the heavenly life, readily leaves all things that he has loved on earth; all that once pleased him among earthly possessions now appears to have lost its beauty, for the splendour of that precious pearl is alone seen in his mind.