Sirach 23:16-18

New Revised Standard Version, Anglicised Catholic Edition

¹⁶ Two kinds of individuals multiply sins,
    and a third incurs wrath.
Hot passion that blazes like a fire
    will not be quenched until it burns itself out;
one who commits fornication with his near of kin
    will never cease until the fire burns him up.
¹⁷ To a fornicator all bread is sweet;
    he will never weary until he dies.
¹⁸ One who sins against his marriage bed
    says to himself, ‘Who can see me?
Darkness surrounds me, the walls hide me,
    and no one sees me. Why should I worry?
    The Most High will not remember sins.’