Even these are the duties of a twice born householder. Those duties really upholds the world. Those duties always and eternally emanate from those pious persons among the Brahmanas who live like householders.
एष द्विजजने धर्मो गार्हस्थ्यो लोकधारणः। द्विजानां च सतां नित्यं सदैवैष प्रवर्तते॥