It is incorrect to say that all of what happens in our life happens for a reason. This is more baby metaphysics. The fact is that most of the events in an average man's life occur accidentally. Philosophers would call this a paradox. But a Toltec sees no contradiction here.
Paradoxes are for the mental body.
When one begins to 'see', paradoxes fall away into knowingness. Our nagual aspect is the unstructured part of ourselves. Our destiny and major themes of our life are set up by our nagual. Our tonal is our personality aspect, which consists of our mental, emotional and physical bodies, is our structured aspect. We have absolutely no control over our nagual.