Friend

विद्या मित्रं प्रवासेषु भार्या मित्रं गृहेषु च
व्याधितस्यौषधं मित्रं धर्मो मित्रं मृतस्य च
– चाणक्य नीति
Meaning : Knowledge is a friend when on journey; wife is the friend at home; medicine is the friend of the sick; virtue is the friend of the dead.