We all have a set of things that we believe in, but over time those are likely to change. Jeff Bezos says we should be free to change our minds, and Malcolm Gladwell believes that consistency is the lamest of all human virtues. Changing your mind, and sometimes your beliefs, is a sign of growth.
Deep down, though, your values should remain largely intact. They might be things such as always doing good, treating others fairly, or anything else that you might value, and those are mostly separate from your beliefs.
Adam Grant put it like this:
“Who you are should be a question of what you value, not what you believe. Values are your core principles in life—they might be excellence and generosity, freedom and fairness, or security and integrity.”
Stand by your values, and always work to have your beliefs support them.