207 Is it possible to be concerned for truth, to seek the truth that responds to life’s deepest meaning? What is law without the conviction, born of age-old reflection and great wisdom, that each human being is sacred and inviolable? If society is to have a future, it must respect the truth of our human dignity and submit to that truth. Murder is not wrong simply because it is socially unacceptable and punished by law, but because of a deeper conviction. This is a non-negotiable truth attained by the use of reason and accepted in conscience. A society is noble and decent not least for its support of the pursuit of truth and its adherence to the most basic of truths.
Source: Fratelli Tutti (Vatican.va)