John Calvin on Matthew 7:3-5

Matthew 7:3. And why seest thou the straw? He expressly touches upon a fault, which is usually found in hypocrites. While they are too quick-sighted in discerning the faults of others, and employ not only severe, but intentionally exaggerated, language in describing them, they throw their own sins behind their back, or are so ingenious in finding apologies for them, that they wish to be held excusable even in very gross offenses. Christ therefore reproves both evils: the excessive sagacity, which arises from a defect of charity, when we sift too closely the faults of brethren, and the indulgence by which we defend and cherish our own sins.

MATTHEW 7:6

Matthew 7:6

6. Give not that which is holy to the dogs, and do not throw down your pearls before swine, lest these trample them under their feet, and those turn and tear you.