1 Corinthians 10:31

Whether therefore ye eat, or drink, or whatsoever ye do. — These words embrace all life. The definite acts of eating and drinking are mentioned expressly as they are the subject immediately under consideration. They are, however, to be regulated by the same principle which guides all true life. The modern idea of some acts being religious and some secular is neither here nor elsewhere recognised by St. Paul. No act of life is in itself either religious or secular. The quality of each act depends on the spirit which guides it, and the motive from which it springs. The commonest thing may be done in a high Christian spirit. The greatest deed may spring from a low and selfish motive. A religious act done in a secular spirit is secular. A secular thing done in a religious spirit is religious. This is “the great first principle” of Christian life.