The Vow of obedience is essentially an act of mystic and spiritual love.
The Son can travel through certain stretch of the spiritual path with will effort, but he must set aside his will at certain point where routes acquire a transcendent character.
With extraordinary exceptions, the soul does not keep the mystical fervor with the same intensity. Periodical enthusiasm and discouragement mark the path toward God. The triumph is of those that, despite their state or stage, never lose sight of the forged ideal.
When the human mind, flying toward high regions of the universal formation, focuses the first Divine Thought –which created the Universe or from which the Universe emerges– this mind gets lost in a dreadful abyss beyond description, and goes astray in the vast waters of the Eternity.