The Catena Aurea (also called The Golden Chain) is a tremendous resource for any pastor or believer who desires to know how the early church understood scripture. It is a verse by verse commentary on the four Gospels by the church fathers that was compiled by Thomas Aquinas.
For each of the four Gospel writers, the Catena Aurea starts by indicating the verses to be analyzed, then phrase-by-phrase, provides the early Fathers’ insights into the passage. It includes the work of over eighty Church Fathers.
The four volume set will cost you about $150, but thanks to Catechetics online, you can read these works for FREE!
Here is a sample of their commentary on John 3:16-19
16. For God so loved the world, that he gave his only begotten Son, that whosoever believes in him should not perish, but have everlasting life. 17. For God sent not his Son into the world to condemn the world; but that the world through him might be saved. 18. He that believes in him is not condemned: but he that believes not is condemned already, because he has not believed in the name of the only begotten Son of God.