Even as wisdom often comes from the mouths of babes, so does it often come from the mouths of old people. The golden rule is to test everything in the light of reason and experience, no matter from where it comes.
It is not given to man to know the whole Truth. His duty lies in living up to the truth as he sees it, and in doing so, to resort to the purest means, i.e., to non-violence. God alone knows absolute truth. Therefore, I have often said, Truth is God. It follows that man, a finite being, cannot know absolute truth. Nobody in this world possesses absolute truth. This is God's attribute alone. Relative truth is all we know. Therefore, we can only follow the truth as we see it. Such pursuit of truth cannot lead anyone astray.
There is no well defined boundary line between honesty and dishonesty. The frontiers of one blend with the outside limits of the other, and he who attempts to tread this dangerous ground may be sometimes in the one domain and sometimes in the other.
But speak the truth, and all nature and all spirits help you with unexpected furtherance. Speak the truth, and all things alive orbrute are vouchers, and the very roots of the grass underground there do seem to stir and move to bear you witness.
Correctitude implies nowadays a formal or fastidious use of words; and what is wanted is not so much the correct as the living use of words. It is the memory of the meaning of a word which is the life of the word.
Perhaps there is no other knowing than the mere competence of the act. If at the heart of one's being, there is no self to which one ought to be true, then sincerity is simply nerve; it lies in the unabashed vigor of the pretense. But pretense is only pretense when it is assumed that the act is not true to the agent. Find the agent.