Constantly refine Yourself
In terms of spiritual growth - realisation of the soul - success is not so much a measurement of size or number, although that can be a reflection; neither is fulfillment about reaching some kind of goal or destination. What I've found for me, is that there's what's real for me; what defines, and best reflects, who I feel I am. This is actually the hardest thing - to know the fineries of yourself in all situations. It's a case of being able to define one's boundaries accurately, by being prepared to explore all the grey areas of uncertainty.