The friend in my adversity I shall always cherish most. I can better trust those who helped to relieve the gloom of my dark hours than those who are so ready to enjoy with me the sunshine of my prosperity.

Someone who stayed while things were bad has shown you something the good times never test. Company is easy to find when there is something pleasant to share in, and it costs almost nothing to be glad alongside you. Sitting with a person through a bad stretch costs patience, and hours, and the discomfort of not being able to fix any of it. That is why the memory of it keeps its weight.

Think of who was there in your worst month. Tell them you remember, without dressing it up. Then try to be that for someone whose bad stretch is happening now.