Quote by Robert A. Heinlein
A competent and self-confident person is incapable of jealousy in anything. Jealousy is invariably a symptom of neurotic insecurity.
Summary
This quote suggests that individuals who are competent and possess self-confidence are not prone to experiencing feelings of jealousy. Jealousy, according to the quote, is always a manifestation of an underlying neurotic insecurity. In other words, when we feel jealous, it may indicate that we have deep-seated insecurities within ourselves. The quote implies that those who are secure in their abilities and confident in their own worth are less likely to feel jealous because they are content and unfazed by comparing themselves to others.