There are so many things you don't need to say to someone grieving and so few things you do need to say. Your presence and total acceptance, with no shame, speaks volumes.
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Your personal nourishment is crucial during times of storm. In panic moments, you'll cut a corner on your meals. You'll also fail to get sufficient sleep. It won't be long before you will set aside prayer altogether and you'll find yourself drained, spiritually. Increased emotional pain mixed with decreased spiritual renewal can be lethal to your faith.