The way I view it, Daniel's point was to focus less on what other people expect of you, and to think less in ways like 'will this help me progress in my career'. Both are examples of extrinsic motivation.
Instead, reframing your goals in terms of serving an intrinsic goal (e.g. 'I do this because it is interesting', or 'I do this because it helps my community') has been shown experimentally to improve longer term persistence at achieving those goals [0].