In a Heroic Journey, the Call to Adventure stage is what starts the story up and running by upsetting the Hero's Ordinary World. It presents a challenge that must be undertaken by the Hero. It is also often delivered by the Herald archetype.
Prior to his desire to aquire more knowledge about spirituality and enlightenment, Siddhartha must have been content with the riches, love, and beauty of the nature around him. However, after this contentness wore off, he "did not give himself joy... [he was] loved by all, the joy of all, [but] nevertheless he bore no joy in him heart."1 In short, he was becoming bored and restless with the material he possessed all his life. His Ordinary World is disrupted by this boredum and restlessness, presenting him the challenge of finding enlightenment, or a meaning to life.
Siddhartha is not within the four stages of enlightenment quite yet, as he recognizes the cause of suffering, and seeks to end it. He still possesses material wealth, a sense of Self, restlessness, etc. His journey is just beginning.
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