jus naturale

natural
-being a relation by actual consanguinity; having a specified character by nature

advertencia

I must warn the reader that indolence, love of ease and obstinacy preclude effective service at the altar of truth, and only freedom from prejudice and untiring zeal will lead one to its reward

verdadero

The farther I advanced from truth to truth, the more my conclusions led me away from the old edifice, which, being built up of opinions, was only maintained by opinions.