Read: John 7:1-24
Anyone who chooses to do the will of God will find out whether my teaching comes from God or whether I speak on my own. (John 7:17)
Do you ever wonder if Jesus actually was what he claimed to be? Do you have trouble at times understanding what he is saying in these tremendous passages, especially in the Gospel of John? Well, if that is the case, he tells you what to do: Practice what he says. Obey his words. Repent of your sins. Come to him. Cast yourself upon his mercy. Believe in his forgiveness, and go out in obedience and treat people the way he says to. Then you will know from an inside knowledge that no one can take away that what he says is true, because his teaching is in line with the reality you are seeing of God at work through you.
This is a principle that runs all through life: You learn by doing. A doctor may learn all that the medical books can teach him, but until he gets his hands into surgery or dispenses medicines to people who are sick he never really learns. The same is true in any field: You learn by doing. When you do what Jesus says, you begin to understand with a deep conviction that he knows what life is all about.