be in this world but not of this world

BE IN THIS WORLD BUT NOT OF THIS WORLD

Jesus said this but living this teaching is essential in order to lead a spiritual life.The meaning of this teaching is not only profound but difficult to practice.
The basic ingredient to life this world is detachment from worldly things, family, and our ego. To be egoless is the most difficult thing to do. In fact the mind can never comprehend what it is like to be egoless.
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