According to Clifford’s thesis, we should not believe something unless we can prove it empirically. But what is the empirical proof for that proposition? Another problem is that few of our convictions about truth can be proven scientifically. While we may be able to demonstrably prove to any rational person that substance X will boil at temperature Y at elevation Z, we cannot so prove what we believe about justice and human rights, or that people are all equal in dignity and worth, or what we think is good and evil human behavior.
