‘Never compare your inside to someone else’s outside’.
Things are rarely how they appear. For example, I’ve always been one to hide adversity in my life by wearing a happy veneer - I’m a great actress. That has clearly and unfairly irked a lot of people throughput my life, who got it so wrong about me. They though I was living a charmed life when it was often very far from the truth.
Then there was the colleague who was such a ‘happy chappy’, yet recently took his own life. That certainly shook up lot of my co-workers.