Jealousy is a disease; love is a healthy condition. The immature mind often confuses one for the other, or assumes the greater the love, the greater the jealousy. In fact they are almost incompatible; both at once produce unbearable turmoil.
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Source, in full
"Jubal Harshaw" in the first edition (1961); this is another line not in the "Uncut" edition of 1991 based on his original manuscripts, because this was one of the lines that Heinlein added, rather than trimmed down, during the editing process of the first edition.