Fidelity by D.H. Lawrence

Man and woman are like the earth, that brings forth flowers
in summer, and love, but underneath is rock.
Older than flowers, older than ferns, older than foraminiferae,
older than plasm altogether is the soul underneath.
And when, throughout all the wild chaos of love
slowly a gem forms, in the ancient, once-more-molten rocks
of two human hearts, two ancient rocks,
a man's heart and a woman's,
that is the crystal of peace, the slow hard jewel of trust,
the sapphire of fidelity.
The gem of mutual peace emerging from the wild chaos of love.