The Pharisees made their first major error in this area of judgment. They had abandoned the proper yardstick for their basis of judgment. As Matthew 15:1-9 shows, they had developed their own traditions that transgressed the law of God (verse 3). Their worship had become vain - worthless - as they substituted the doctrines of men for the doctrines of God (verse 9).
The Pharisees had lost touch with God's instructions, His mind. They leaned on carnal reasoning, which always decided in their favor. Situation ethics ruled, rather than the precepts of God. They became very harsh in their dealings with the "little people," taking advantage of them simply because they could (Micah 2:1-2).
"A just weight and balance are the Lord's; all the weights in the bag are His work. It is an abomination for kings to commit wickedness, for a throne is established by righteousness" (Proverbs 16:11-12). Though the Pharisee's "additions" to the law seemed innocent enough at their inception, over time they became increasingly partial to those who made the additions. This destroyed godly standards, and wickedness reigned. Since the leaders' righteousness had been destroyed, their leadership was void of justice. Significantly, the Bible's final warning is not to add to or subtract from God's Word (Revelation 22:18-19), for our own judgments do not have the purity and objectivity of God's.
This problem never seems to go away. Christ excoriated the Pharisees for it. James addressed the church about it because some were showing partiality to the wealthy in the congregations (James 2:1-12). Decision-making, judging, discerning, and evaluating fruits often become subjective. We base them on how they may affect our own well-being rather than render them impartially and objectively in the light of God's Word purified seven times (Psalm 12:6). Is it any wonder God gives us an average of 70 years to learn to make right judgments?
The Weightier Matters (Part 2): Judgment