A competent and self-confident person is incapable of jealousy in anything. Jealousy is invariably a symptom of neurotic insecurity.

Source: Time Enough for Love (1973) by Robert A. Heinlein; Intermission: Excerpts from the Notebooks of Lazarus Long, page: 250.

Love is the condition in which the happiness of another person is essential to your own. Jealousy is a disease; love is a healthy condition. The immature mind often confuses one for the other.

Source: Robert A. Heinlein, Stranger in a Strange Land (1961; 1991)

Jealousy is a disease, love is a healthy condition. The immature mind often mistakes one for the other, or assumes that the greater the love, the greater the jealousy – in fact, they are almost incompatible; one emotion hardly leaves room for the other.

Source: Robert A. Heinlein, Stranger in a Strange Land (1961)

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A competent and self-confident person is incapable of jealousy in anything. Jealousy is invariably a symptom of neurotic insecurity.

Source: This quote is from a science fiction novel “Time Enough for Love” (1973) by Robert A. Heinlein.