Tiruvalluvar

“ Who every good have killed, may yet destruction flee;
Who 'benefit' has killed, that man shall ne'er 'scape free!
He who has killed every virtue may yet escape; there is no escape for him who has killed a benefit. ”

“ Kindness of men of stainless soul remember evermore!
Forsake thou never friends who were thy stay in sorrow sore!
Forsake not the friendship of those who have been your staff in adversity. Forget not be benevolence of the blameless. ”

“ Assistance given by those who ne'er received our aid,
Is debt by gift of heaven and earth but poorly paid.
(The gift of) heaven and earth is not an equivalent for a benefit which is conferred where none had been received. ”