"Even if all these needs are satisfied," Maslow wrote, "we may still often expect that a new discontent and restlessness will soon develop, unless the individual is doing what he is fitted for." He called this self-actualisation. "A musician must make music, an artist must paint, a poet must write, if he is to be ultimately happy. What a man can be, he must be." This is not about career in the narrow sense. It is about the drive to fulfil your specific potential — to become more and more what you are, to close the gap between what you are and what you are capable of being. For one person it takes the form of building a business. For another, raising children well. For another, creating something. For another, leading a community. The form varies completely by person. What does not vary is the restlessness that comes when it is blocked. The sense of something unfinished, of living beneath yourself, of doing work that is adequate but not quite it. Maslow made an important observation: self-actualisation is rare, not because people do not have the drive, but because the lower needs so often remain unsatisfied enough to dominate attention. A person fighting for safety or starved of belonging is not free to fully inhabit their potential. The hierarchy is not a theory about high achievers — it is a theory about what makes it possible for anyone to arrive at their own version of that top level. He also noted that the people best equipped to withstand difficulty are those who were securely satisfied in the lower needs during their formative years. Security is not the enemy of ambition. It is often what makes genuine ambition possible.