Matthew 13:35

The writer claimed that this portion of Jesus’ ministry fulfilled Asaph’s statement in Psalms 78:2. Asaph wrote that he would explain to his readers aspects of Israel’s history that had been previously unknown. He then proceeded to use Israel’s history to teach the Israelites how consistently rebellious they had been toward God and how just and merciful God had been with them. He taught these lessons by using "parables," by comparing various things. By comparing various incidents in Israel’s history he revealed things previously unclear. Stephen used the same technique in Acts 7.

Jesus did the same thing when He taught the multitudes using parables. He revealed to the people some things that they had not previously understood. Jesus was not teaching entirely new things any more than Asaph was in Psalms 78. He put things together that taught the crowds new lessons. Jesus concealed some truth by using parables, but He also revealed some truth to the multitudes with them. This is the point of Matthew’s quotation of Asaph here. Jesus was bringing together pieces of previous revelation about the kingdom and by combining these was teaching the people new things about the kingdom. He was throwing new light on the kingdom with His comparisons (parables). Thus while these parables were mysteries, new revelations, they contained some elements that God has previously revealed.