When Jesus heard this, he said to him, "You still lack one thing. Sell everything you have and give to the poor, and you will have treasure in heaven. Then come, follow me." When he heard this, he became very sad, because he was a man of great wealth. Jesus looked at him and said, "How hard it is for the rich to enter the kingdom of God! Indeed, it is easier for a camel to go through the eye of a needle than for a rich man to enter the kingdom of God. (Luke 18:22-25)

The encounter of Jesus with the rich young man is repeated in Matthew 19, Mark 10, and here. The similarity of construction here and in other verses, including his embrace of the little children, have caused some scholars to argue that Matthew and Luke are each derived from Mark.

Other scholars, noting that Matthew and Luke share many similarities not found in Mark, have suggested a missing Q Gospel (from the German Quelle or source). While the existence of Q is widely accepted no physical evidence has ever been confirmed.

In any case, there are important relationships. We understand each gospel better in considering all gospels. We improve our understanding of the gospels by considering their relationship with historical, cultural, and literary context. Mostly, we experience the good news by finding and making relationships between these ancient words and our daily life.