I care not so much what I am to others as what I am to myself.
-- Michel de Montaigne
I think many people may protest against that idea. They'd feel that we are only here to serve others. That what we mean to, and do for, for example our family is everything, otherwise one is just being selfish.
But I think it has a lot of merit. It does not mean that one should only work for and care for oneself, but that one can only *judge* oneself. One's self and one's connection to higher forces and callings. What others say should be taken into account, but the final judgement and decisions must be one's own, alone.
Otherwise one is adrift on a sea of opinions, going to and fro as fashions change. Only be evaluating things by the best of one's abilities and then taking a firm stance and working from there, does one have a chance of making progress.
I think it would be very hard to find anybody who has made remarkable, unique achievements, who has also not at some points been in spectacular disagreement with many of his contemporaries, maybe even to the point of violent attacks.