Oxygen (O) represents the masculine principle, hydrogen (H2) the feminine principle, and water is their child

"It is interesting to study the chemical formula for water (H2O) from a symbolic point of view. Oxygen (O) represents the masculine principle, hydrogen (H2) the feminine principle, and water is their child. Within us, oxygen is the intellect and hydrogen the heart. The intellect, the masculine principle, is one thing; the heart, the feminine principle, is another. They can live separately side by side, but unless they are united they cannot produce water, which is life. Everywhere we see this separation between heart and intellect: in marriages where the husband and wife endlessly argue, in society where people of the intellect battle people of the heart, and especially within human beings themselves, whose thoughts go in one direction and feelings in another.

What can you do to unite heart and intellect? You must introduce fire, like the spark which unites oxygen and hydrogen, but true fire, the fire of the spirit. United by this fire, the heart and the intellect give birth to children, in other words, to acts of great wisdom and goodness."