Mark 1:34: And he healed many who were sick with various diseases, and cast out many demons; and he would not permit the demons to speak, because they knew him. The gospel passage is not from John, but from Mark, as quoted above. First of all, nowhere in that text does it suggest Jesus did not heal everybody. In fact, comparing this to many other similar passages, it suggests the contrary, that Jesus in fact did heal all who came to him seeking healing. As to Jesus appeared to become tired, that is indeed true. But remember that Jesus in coming among us, freely chose to empty Himself of His glory, hiding His divinity, so to manifest Himself mainly as one of us. He therefore shared in our human limitations as much as possible during His earthly life. He was therefore experiencing truly our hunger, our thirst, our need for rest, our bodily limitations.