The term, symbol comes from the Greek word sunbolon, which means put together. In ancient times, the sunbolon was an identifying token. It was an object split into two halves. Only the individual who possessed one half of the symbol was allowed to join the group or the tribe that held the other half. These days, the symbol has lost its original function; now, it is just considered as a veiled truth. Esoteric secrets are veiled, but understanding the symbol makes it possible to remove the veil and know the truth. Through the symbol, we can make a synthesis between different levels of existence, spirit and matter, sky and earth, cause and effect, part and whole. The sky is the most widespread symbol in humanity. All religions associate the sky with supernatural. Through the symbol the different parts become one. Symbols are not the creation of the human mind but predate it. You can find the same symbols in different parts of the earth, in populations very far from each other. For instance, the swastika is one of the most ancient and widespread symbols. Hitler borrowed it from ancient cultures. The swastika existed in India, Rome, America, and many countries since time immemorial. It was considered a bearer of good luck, peace, and well-being. Not everybody can easily understand symbols; this faculty belongs to mystics, initiates, and heroes.