महाभारत - उद्योग - षडेते ह्यवमन्यंते

षडेते ह्यवमन्यंते नित्यं पूर्वोपकारिणं
    आचार्यं शिक्षिताः शिष्याः कृतदाराश्च मातरम् ।
नारीं विगतकामास्तु कृतार्थश्च प्रयोजकम्
    नावं निस्तीर्णकांतारा आतुराश्च चिकित्सकम् ॥

- महाभारत, उद्योग

Shad ete hi avamanyante nityam pUrvopakAriNam
    aachAryam shikShitAH shiShyAH kRutadArAH cha mAtaram ।
nArIm vigata kAmAH tu kRutArthashcha prayojakam
    nAvam nistIrNakAMtArA aaturAshcha chikitsakam ॥

- mahAbhArata, udyoga

The following six people are known to forget those who helped them before - students forgetting their teachers, daughters forgetting about mothers after marrying, a mendicant who has no interest in sensual pleasures forgetting the ladies who gave him pleasures, any beneficiary of help forgetting the benefactor, people forgetting the boatman after crossing the river and patients forgetting about the doctor after being treated.

- Mahabharata, Udyoga