What Determines The Strength Of The Soul?

Question: What determines the strength of my soul? Can I increase it?

Answer: The strength of the soul depends on one’s egoism, on what thickness of the ego you can rise above; this is what determines the strength of the soul.

The soul is the property of bestowal and love, which we receive through the upper Light. Therefore, it can be achieved only through annihilation of egoism.
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From the Kabbalah Lesson in Russian 2/4/18