Within every love, there is fear: The fear of separation from that which you love.
A child fears separation from her parents, a lover from his beloved, the body fears separation from the soul, and the soul from its Source Above.
So what do you love? Look at your worries and you will know. If you seethe in worry over your debts and financial future, then it is the material world you love—because you believe in the material world and you see it as the source of all good.
If you sit and fret over the comments of others and the glances they throw at you, then it is social acceptance that you love, that you have made into your god.
Cleave to the Source of Life and your heart will have no room for fear of this world.
To cleave to G_d is to rise above our egoistic attitude and aspire to love of G_d through goodness towards others.
This isn't simple since egoism is our nature, a program that operates within us.
We can choose to rise above ourself but we uncontrollably slip back into our egoistic ways. Our mind shifts back into our desires of the material world and our self immersion.
This causes our separation anxiety, the fear of disconnection from G_dliness, the greatness of G_d's qualities, the source of love, peace and joy.