Aim at something profound and noble and lofty. If you can find a better path along the way, once you have started moving forward, then switch course. Be careful, though; it is not easy to discriminate between changing paths and simply giving up. (One hint: if the new path you see forward, after learning what you needed to learn along your current way, appears more challenging, then you can be reasonably sure that you are not deluding or betraying yourself when you change your mind.)
