The more labels you have for yourself, the dumber they make you. - Paul Graham
The quote is actually the last sentence from Paul Grahams essay Keep Your Identity Small. It reminds me always to stay open to change and don’t label myself as a specific A, B, C, X, Y or Z.
Use less labels for yourself, so that your life is not too constraint.
Also if you believed in something first and you agreed with it first, if it turns out that it isn’t true, to accept the fact and change your mind according to this new fact.