If we reflect that prayer is the highest human activity—the defining purpose of human existence and the goal of human destiny—we should say that Jesus’ prayer reveals more about him as a human being than anything else he did.
…In prayer a human being is engaged with existence in its fullness. First, when a person prays, he represents the whole created order, of which he is the conscious, self-reflective part. It is in the prayer of human beings that creation becomes conscious of its relationship to God. Man is the thinking part of the cosmos. In the entire material world, the only being that even thinks to pray is man. Human thought is the only place where the cosmos is self-reflective. Second, when someone prays, he represents history, which has bequeathed to him the very language he uses to speak and to think. To pray is to take an heir’s possession—by language—of all that has transpired during man’s existence in this world. We are no more able to separate ourselves from the time of human history than from the space of the created order.
From The Jesus We Missed: The Surprising Truth About the Humanity of Christ by Patrick Henry Reardon.