Credibility makes your future words heavier.

The same sentence carries different weight depending on who says it. Someone with a long record of accuracy is heard differently, taken more seriously, argued with less. That weight is not a personality trait; it is accumulated evidence, and it is what makes it possible to be effective without volume. Every accurate statement now is buying force later.

Think of your credibility as a balance you are either adding to or spending. Then look at where you have been spending it, on claims you did not need to make, on certainty you did not have. Protect it for the things you actually care about.