> El ocio es la madre/padre de todos los vicios
I really don’t like this, because it is a moral view with no real justification (someone gets to decide what a vice is, which is historically a tool of oppression). For example, not that long ago lower-class people having outrageous hobbies such as reading or participating in politics was considered morally unacceptable.
However, there is a kernel of truth in that we need to have some meaning in our lives otherwise we just wither psychologically and then physically. Sometimes being forced to do something (“work”) helps us getting some of that. But the amount of stuff we need to do to live somewhat happy lives varies from person to person. Ultimately, this should be the absolute criterion: the right amount of activity is that which makes us live satisfying lives. Some people need a lot, some do not.