Ye fools. Jesus adds to "blind" the epithet "fools," which implies not only the irrationality and absurdity of their practice, but also its moral delinquency, the fool in sapiential language being the sinner.
The temple that sanctifieth the gold. Our Lord shows the absurdity of this sophistical distinction. It was because the temple was the place of God's presence that what was therein was consecrated. The gold was nothing without the temple; the temple, the originally holy, is superior to the gold, the derivatively holy, and an oath that calls the temple to witness is surely obligatory.