Islam — as the Qur’an explains in several places — considers the purpose behind the creation of man and woman, their coexistence, and ultimately their marriage, to be their mutual stability and tranquility.

This meaning is expressed in the noble verse: “And He created from it its pair, that he might find tranquility in her”.

The expression sakīn (tranquility) appears, as far as I recall, in two places in the Qur’an.

God, Blessed and Exalted, created a spouse for the human being from his own kind — the spouse of a woman and the spouse of a man both being of their own nature — “so that he may find tranquility in her.”

This means that a person, whether man or woman, finds inner peace beside their spouse.

This stability, tranquility, and protection from spiritual turmoil is extremely important, for the arena of life is an arena of struggle.

A human being is always vulnerable to some kind of inner disturbance.

— Sayyed Ali Khamenei