tiri kadugam

http://raghu-vraghava.blogspot.com/
पूवादु काय्कुम मर्म उल
नन्द्ररिवार मूवादु मूत्तावर नूल वल्लार
तावा विदैयामै नारुव
वित्तुल मेदैक्कू उरैयामै चेल्लुम(चोल्लुम) उनर्वु

there are trees bearing fruits without flowers like the jack fruit..phanas...pala,kathal.
in the same way there are wisemen who are not physically aged
there are plants which grow without sowing seeds or enclosing the area with bund for watering.
likewise without reference by a mentor one can identify wisdom of a wise men.