Tiruvalluvar

“ Kural - 353
When doubts disperse, and mists of error roll
Away, nearer is heav'n than earth to sage's soul.
Heaven is nearer than earth to those men of purified minds who are freed from from doubt. ”

“ The truth of things, man's dignity- 'tis wisdom true.
True knowledge consists in the removal of ignorance; which is (the cause of) births, and the perception of the True Being who is (the bestower of) heaven. ”

“ To them whose spirits lack perception of the true?
Even those who have all the knowledge which can be attained by the five senses, will derive no benefit from it, if they are without a knowledge of the true nature of things. ”