Envy is often associated with the color green, as in "green with envy", and yellow. Yellow is the color of ambivalence and contradiction; a color associated with optimism and amusement; but also with betrayal, duplicity, and jealousy. The phrase "green-eyed monster" refers to an individual whose current actions appear motivated by jealousy not envy. This is based on a line from Shakespeare's "Othello". Shakespeare mentions it also in "The Merchant of Venice" when Portia states: "How all the other passions fleet to air, as doubtful thoughts and rash embraced despair and shuddering fear and green-eyed jealousy!" The character Envy from Fullmetal
Jealousy "yeast"). The "biblical language" zeal would be known as "tolerating no unfaithfulness" while in middle English zealous is good. One origin word "gelus" meant "Possessive and suspicious" the word then turned into "jelus." Since William Shakespeare's use of terms like "green-eyed monster", the color green has been associated with jealousy and envy, from which the expressions "green with envy", are derived. People do not express jealousy through a single emotion or a single behavior. They instead express jealousy through diverse emotions and behaviors, which makes it difficult to form a scientific definition of jealousy. Scientists instead define jealousy in their