I'm currently reading Marianne Williamson's Tears to Triumph. The book opens with this poem:
Let my joyfully streaming face make me more radiant;
let my hidden weeping arise and blossom.
How dear you will be to me then,
you nights of anguish.
Why didn't I kneel more deeply to accept you, inconsolable sisters, and, surrendering, lose myself in your loosened hair.
How we squander our hours of pain.
How we gaze beyond them into the bitter duration to see if they have an end.
Though they are really our winter-enduring foliage, our dark evergreen, one season in our inner year–, not only a season in time–,
but are place and settlement, foundation and soil and home
"Discomfort is the price of admission to a meaningful life." Tell your son if he doesn't allow himself to feel the full spectrum of human emotions he will become shallow and have shallow relationships. He can FEEL his emotions. Emotions are natural and healthy. But they should not OWN him. Feeling the full spectrum of emotions: healthy. Being eaten up by emotions and allowing them to be too out of control so they end up ruining your mental health and relationships: extremely unhealthy, even deadly.
Watch Susan David's TED Talk on how to control emotions in a healthy way:
https://www.ted.com/talks/susan_david_the_gift_and_power_of_emotional_courage
I highly recommend her book, Emotional Agility, as well. This is how you deal with life on life's terms with courage, wisdom, and power. I am happy and positive, but not to the exclusion of my emotions and denial of reality. We are nature- there will be thunderstorms, rainy days, sunny days, etc. I think humanity has desensitized in a big way. Everyone craving constant sunshine. Well, the desert shows how that pans out. Lush green environments need some rain. Besides without emotions we'd be robots.