Luke 21:14-15 - But make up your mind not to worry beforehand how you will defend yourselves. For I will give you words and wisdom that none of your adversaries will be able to contradict.
Before Jesus says this He warns us that there will be persecutions in our lives. We will face trials and troubles because of Him. Then He tells us this. Jesus knows that it is common for us to worry. Especially when we know something is coming; we want to make sure we are ready. Sometimes we spend hours or even days trying to play out the situation in our minds, so that when it comes we are prepared and have the “right things” to say.
In this passage Jesus doesn't just tell us not to worry, He says “make up your mind not to worry.” It’s a conscious decision. We have to make a choice, “No matter what happens I will not worry.” Then comes the promise. Jesus doesn't stop at, “Don’t worry.” He goes on to give us reason why we do not have to worry, “I will give you words and wisdom that none of your adversaries will be able to contradict.” Basically we are promised words that no one will be able to argue with.
Your situations will be like those of Jesus. When the Pharisee’s would approach Jesus, looking to trap Him in His words, they would be left dumbfounded. They would ask Him a trick question, He would answer, and the bible says, “they were amazed at His wisdom and did not ask Him anymore questions.” That is how it will be for us.
We do need to realize that it is not our words or wisdom that will stop people in their tracks, it will be God’s wisdom through us. That is why we do not need to worry beforehand. No matter how much time or effort we put into our preparation, we could never come close to matching the wisdom of God. So, make your preparation in the Word of God and prayer and then trust Him to speak through you when the time comes.