When our neighbor comes to us with his troubles, we take part in them, but if we do not know how to relax–to give all our infirmities and those of our neighbor to the Lord–then we bear this cumbersome burden in our own minds and hearts and, over time, we become unbearably stressed and nervous. We become irritable; we cannot stand our own selves, let alone other people around us–our family members and, of course, our co-workers. Our life becomes miserable and stressed, and our nerves become strained. This is because we have not taught ourselves to let go of our thoughts. When our thoughts are at peace, our body rests too.
Elder Thaddeus, Our Thoughts Determine Our Lives