I say: liberate yourself as far as you can, and you have done your part; for it is not given to every one to break through all limits, or, more expressively, not to everyone is that a limit which is a limit for the rest. Consequently, do not tire yourself with toiling at the limits of others; enough if you tear down yours. [...] He who overturns one of his limits may have shown others the way and the means; the overturning of their limits remains their affair.