What is truth?

In Vedas, (Atharvveda) in a chapter for political management (Vedas are spiritual books which deals with every aspect of life including science, physics, geology, mathematics, political science etc theology etc and Rigveda is considered to be the oldest scripture of the world)...I read about truth. It says the truth is that which informs the manager of a society about the actual conditions and problems and ways of progress towards the benefits of each and every individual of society in accordance with his individual liberty and his duties regarding the society. The truth is that which informs a citizen, the actual sense of right and wrong with respect to his abilities of rational faculty.

Truth is that which is backed by reason.
Almost similar ideas I read again in books of Ayn Rand, when she said, A is A!

I wonder but I understand, that no matters how old a book is, if it has got some reasonable explanation about its content, and if the reason is valid, it will itterate similar message. I find no difference between spiritual scriptures of Vedas and Atheistic views of Objectivism.