The Torah teaches us that night precedes day. First came evening and only then morning. This is a world which starts in deficiency, in night. In this world, perfection can only come after imperfection. Morning can only come after evening.
Light can only come after dark.
In the existence beyond this world, perfection can exist without a preceding imperfection. That is a world of truth. A world of light. A world of total revelation. But in this world we can only approach perfection by a journey from the imperfect.