What does Matthew 12:36 mean?
This is yet another reference to the day of judgment. This will happen at Christ's triumphant return to earth, also called the second coming or the day of the Lord. When Jesus returns, He will hold all people accountable for their words and actions. This includes even a person's "every careless word."Scripture implies there will be two major judgments taking place in the end. Christ will be judge at both. One is for all who have rejected Christ (John 3:36) and refused God's gift of eternal life through putting their faith in Jesus (John 5:22–29; Revelation 20:11–15). Non-believers will be judged on their own righteousness and come up short of reaching God's standard (Romans 3:23). This is often referred to as the "white throne judgment."
The other judgment will be of those who are Christians. This is sometimes called the judgment seat of Christ, or the "Bema seat." There, Jesus will examine each believer's words and works and determine what rewards will be given or withheld in eternity (2 Corinthians 5:10). That judgment does not determine eternal destiny, nor can a believer lose their salvation there (John 10:28).
Matthew 12:33–37 contains Jesus' harshest rebuke of the Pharisees in this chapter. The immediate context of this criticism is their blasphemy against the Holy Spirit: attributing a miracle of Christ to Satan. Here again, Jesus explains how actions demonstrate a person's inner heart. That includes speech, which is the natural overflow of our thoughts and attitudes. Like a diseased tree, the Pharisees produce bad fruit. They are compared to vipers, associating them the Devil and evil. Echoing His teaching on God's perfect righteousness (Matthew 6:1, 5, 16), Jesus declares we are accountable for every word we say.
Matthew 12 features confrontations between the Pharisees and Jesus over several issues. Among these are working on the Sabbath, healing on the Sabbath, and the source of His power to cast out demons. Jesus counters each argument and rebukes the Pharisees sharply for their obstinate unbelief. He even notes that those who maliciously ascribe His miracles to demons are unforgivable. He warns them, and the rest of their current generation, about the judgment to come. Jesus calls the Pharisees a brood of vipers and rejects their demand for another miracle. All they'll be promised is the sign of Jonah. The Son of Man will be in the heart of the earth for three days. Jesus also states that all who do His Father's will are His family.