"To believe your own thought, to believe that what is true for you in your private heart is true for all men, — that is genius. Speak your latent conviction, and it shall be the universal sense; for always the inmost becomes the outmost" RWE
Wisdom and Truth don't change with time. That is why this quote is as relevant today as when it was written 170 years ago.
They remain the same because Wisdom and Truth are thinking processes we can use to guide our thoughts to the best decisions. Moment by moment we choose our truths. If we choose what is true in our "private heart" our outer world will become what we, as children, thought it could become.
"Wisdom is the freedom and ability to make the kinds of choices that evolve our life and contribute to the planet." DM