Christianity substitutes what is obedience to a person for that of obedience to a law. In legal obedience a person fulfills a contract which he has undertaken. Christian obedience is like that of a slave (servant) to his master whom he loves. He does what his master tells him without a will of his own.
If I bid my child to do three things and he only does two of them, which he likes to do and takes his own way in the third, insubordination of will is as much shown by his disobedience in one point as if he had in all.
Christ’s obedience was perfect and is our pattern. He was put through every trial to see if there was in Him any unwillingness to obey—that is sin—and it could not be found. In the Garden of Gethsemane He chose rather to have God’s face hidden than fail to obey. He became obedient unto death, even the death of the cross. There is nothing so humble or so unselfish as obedience. It supposes that we have no will of our own.
Christian Truth 9:336