Jesus reminds me here of the long distance runner. Think of the Marathon runner. There has to be a settled determination in your heart if you are going to win a Marathon.
You train for the distance, for the conditions, your diet and liquid intake has to be measured and controlled; the opposition could be a factor; your health also needs to be good. But you have to plan, you have to train, you have to be well prepared just to complete the 26.2miles which is just over 42 kms.
That’s a very long way.
(http://www.onlineconversion.com/length_common.htm) (26.2 mile = 42.164kms)
Make no mistake, Jesus was prepared in just such a way. It was all part of the cost of obeying His Father’s calling on His life as our Saviour.