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Tara in Tantric Buddhism was born from the tears of Avalokitesvara, the boddhisattva of compassion, and personifies His compassion. She has many forms, including White Tara, and can be gentle or menacing depending on Her color--as Green or White Tara, She is compassonate and helpful; as Red, Yellow, or Blue Tara She is fierce and protective.
In Buddhism Her name is usually translated "Saviouress," or "She Who Leads Across," which refers to Her role in helping liberate humanity from Samsara, the Ocean of Illusion. But Tara as Star still resonates, as the constellations are used to help ships navigate the Seas, and She is indeed sometimes described as a boatswoman.
She is called "Mother of All Buddhas," and is appealed to for help in protecting against the Eight Great Dangers. Green is the color of Her main form and indicates Her nature of active compassion; She is known for helping those in need with lightning quickness.
Tara, like other Bodhisattvas, began Her life as a human like the rest of us. When She became enlightened, She decided not to pass on to Nirvana, but to stay on the doorstep, so to speak, and help humanity through Her rebirths. Now this is the usual vow of the Bodhisattvas, but to this Tara added one thing: She would be reborn only as female.
This card signifies an active type of compassion that calls you to get out and help people. You have the energy and passion to make a difference in others' lives now.