Envy and jealousy are the private parts of the human soul. Perhaps the comparison can be extended.
Friedrich NietzscheDo not be deceived! The busiest people harbor the greatest weariness, their restlessness is weakness--they no longer have the capacity for waiting and idleness.
Friedrich NietzscheRemain faithful to the earth, my brothers, with the power of your virtue. Let your gift-giving love and your knowledge serve the meaning of the earth. Thus I beg and beseech you. Do not let them fly away from earthly things and beat with their wings against eternal walls. Alas, there has always been so much virtue that has flown away. Lead back to the earth the virtue that flew away, as I do—back to the body, back to life, that it may give the earth a meaning, a human meaning.
Friedrich Nietzsche