[sjjshzvuiajhz]

People do good things and bad things. If in the presence of a combination of good things and bad things, you focus on the bad things and the bad things dominate your subjective experience of existence, you are probably suffering from depression.

[coldtea]

Or, you know, not all periods have a balance of "good things and bad things".

[sjjshzvuiajhz]

Sure, if you’re sad because you’re starving in a drainage ditch, or your best friend just died, that doesn’t mean you’re depressed. But if your basic needs as an organism are met, you have great latitude to occupy your brain with thoughts that make you happy or sad.