"According to traditional teachings, there are two elements respectively that fit well together, while the other combinations are more difficult. Fire and air are considered to be masculine elements that are related to each other and harmonize well, as do the feminine elements of earth and water.
Popular astrological partnership predictions, usually follow this simple basic pattern. It’s obvious that we can get along well with the signs of the same element. After all, we are in our own element with them, which means we look at the world in the same way."

"What motivates people? What gets them out of bed in the morning? How do they go about getting what they want? Look to the position of Mars in the natal chart for answers."

" Empedocles, a fifth century BCE Greek philosopher, originated the terms Fire, Earth, Air, and Water. He explained the nature of the universe as an interaction of two opposing principles called love and strife manipulating the four elements. He stated that these four elements were all equal, of the same age, that each rules its own province, and each posseses its own individual character. Different mixtures of these elements produced the different natures of things.

"As recently as a few thousand years ago, Western scientists considered the whole earth to be made of 4 elements: Earth, Air, Fire, and Water. Even though science has taken a different turn, we can still use this ancient wisdom to make sense of the world."

Description of sign elementes and qualities: cardinal/fixed/mutable , fire/earth/air/water, active/receptive.

"These reprocess and filter planetary energy. The signs themselves reveal psychic patterns and life-potentials which, when functioning freely and openly, are all balanced and whole in themselves, and have their own ways of manifesting completeness and enlightenment. But they each have characteristic ways of becoming obstructed, corrupted, twisted and hampered as well – and these aspects of the human psyche, and of society and civilisation, we are all nowadays well accustomed to.

"Fire, Air, Earth, and Water, the four elements, sometimes called the Triplicities, play an important part in astrology. The term triplicities comes from the fact that there are three signs associated with each of the four elements.