Thoughts: Blind guides are not trustworthy. The Pharisees thought they saw and understood but they were confused (foolish) and blind.
Here Jesus rebukes them for valuing gold over worship. They were willing to swear by the gold but not by the Temple as the steadfast valuable thing to swear by. This is one of the problem of our day- we are so materialistic that we think the gold makes the church- not that the church itself is golden. We tend to value the best stuff of earth more than the best stuff of God. God is the maker both of gold and the Temple. Jesus is trying to help people to value the house of God more than they do. We who believe in Jesus need to hear His teachings on this.
Prayer: Let me see clearly what you value, O God. Give me grace that my values would be more and more in line with yours.