Zoroastrian theology includes foremost the importance of following the Threefold Path of Asha revolving around Good Thoughts, Good Words, and Good Deeds. There is also a heavy emphasis on spreading happiness, mostly through charity, and respecting the spiritual equality and duty of both men and women. Zoroastrianism's emphasis on the protection and veneration of nature and its elements has led some to proclaim it as the "world's first proponent of ecology." The Avesta and other texts call for the protection of water, earth, fire and air making it, in effect, an ecological religion: "It is not surprising that Mazdaism…is called the first ecological religion. The reverence for Yazatas (divine spirits) emphasizes the preservation of nature (Avesta: Yasnas 1.19, 3.4, 16.9; Yashts 6.3–4, 10.13)." However, this particular assertion is undermined by the fact that early Zoroastrians had a duty to exterminate "evil" species, a dictate no longer followed in modern Zoroastrianism.