Role of a Guru: Everyone who is 50 Years and above carries a responsibility of sharing his knowledge with the world. Sharing this knowledge absolves you of the sins and gets divine blessings for you.
श्रेयान्द्रव्यमयाद्यज्ञाज्ज्ञानयज्ञ: परन्तप |सर्वं कर्माखिलं पार्थ ज्ञाने परिसमाप्यते || 4.33||
O subduer of enemies, sacrifice performed in knowledge is superior to any mechanical material sacrifice. After all, O Parth, all sacrifices of work culminate in knowledge.
यज्ञदानतप:कर्म न त्याज्यं कार्यमेव तत् | यज्ञो दानं तपश्चैव पावनानि मनीषिणाम् || 18.5||
Actions based upon sacrifice, charity, and penance should never be abandoned; they must certainly be performed. Indeed, acts of sacrifice, charity, and penance are purifying even for those who are wise.