First off, the 'slogan' below is a reworking of a quote from Pope Benedict, and his comes across much stronger:
Fulfillment does not lie in comfort, ease, and following one’s inclinations but precisely in allowing demands to be made upon you, in taking the harder path. Everything else turns out somehow boring anyway. Only the person who recognizes and ideal he must satisfy, who takes on real responsibility, will find fulfillment.
Unfortunately, we can't find the attribution. :(
And Barb wins the prize here for her comment in the 'Post 300' thread. Thanks for the kind wishes, Barb.