Verse
तस्माच्छास्त्रं प्रमाणं ते कार्याकार्यव्यवस्थितौ ।ज्ञात्वा शास्त्रविधानोक्तं कर्म कर्तुमिहार्हसि ॥
Therefore let the Shastra be thy authority in determining what ought to be done or what ought not to be done. Knowing what hath been declared by the rules of the Shastra, thou oughtest to work in this world.
Gītā 16·24