True that, what "clinical" depression usually is is being sad for no reason. It is natural to go through this sadness if there is a reason. I have depression, I have days of sadness and low motivation for no reason, life is good, the sun is shining, I have every reason to be joyful, but the chemicals in my brain are off so I feel depressed. It triggers the wrong emotion for the outside stimuli. I also feel anger and or anxiety when there is no reason to. The brain is an interesting thing. If the chemistry is off it can trigger emotions that are not the correct response to the outside stumuli.