Do you always speak the truth. Never speak an untruth. Truth is an cternal duty. It is by truth that Harishchandra roves through the sky like a second Moon.
सत्यं वदत मासत्यं सत्यं धर्म: सनातनः। हरिश्चन्द्रश्चरति वै दिवि सत्येन चन्द्रवत्॥