Jesus said the He is the Truth. This means that all truth and only the truth is in Him. He cannot deceive nor can we deceive Him. We can trust what He says. We can know that what He speaks is true, what He brands evil is evil and what He calls good is good. Measure what you hear or read against what Jesus said. He is the truth. What is that which you are investigating? Does it match up with what Christ says or does it contradict it? Your answer will tell you where the truth resides.