The eagle and the serpent
The colours of the flag are declared to be peculiar to the emancipation movement with respect to Spain and they became the national flag colours with the independence in 1821. The coat of arms, under its current form, was added in 1968. It depicts an eagle on a barbary fig holding a serpent in its beak and reflects an Aztec legend about the foundation of “Tenochtitlán”, the capital of the Kingdom. Sent by the god “Huitzilopochtli”, a bird is supposed to have led the founding people from a northeast region called “Aztln” (meaning white land or heron's country) to a spot where he sat atop a prickly pair barbary fig (tenochtli) growing out of a rock. He told the people to build their capital on that piece of land surrounded by water, which, later on, became Mexico City.
The coat of arms of the flag depicts the fight between the eagle and the serpent, Heaven and Earth, the worlds above and below. No wonder, therefore, to see the eagle among the Christ's attributes.
However, the barbary fig shaped as a cup symbolizes also the hatching of the “World Egg” and the accompanied Word, the word exhorting to the union of Heaven and Earth described by number of Gods within various traditions.
The flag reminds us that if the fight is a necessary step in the world here below, it could not be a goal, which comes under the above world. A goal consisting in the union of the being with himself and of all beings gathered under the same banner as well.