No sailor of the seas has ever chosen its profession - to exist is to sail, and that is reality. No sailor of the seas has ever chosen its aim either - no a priori one seems to exist. To exist is to deal with the fact that you are a sailor, and that there is no set-in-stone aim to sailing.
Any sailor needs to conceive a model about the sea in order to navigate it. To know absolute nothing about the sea means certain death; to presume to know too much is to ignore the volatility of tides. The mind of the good sailor then has to exert a delicate balance between ignorance and fundamentalism - it has to be able to know something about the tides in order to escape death, but be open and flexible to feedback from nature for the exact same purpose. This mind ceaselessly walks the treacherous psychological rope between death by order and death by chaos, rigidity and fluidity, the freezing powers of ignorance and the all-consuming powers of certainty.