Such individuals lead vigorous lives, are open to a variety of experiences, keep on learning until the day they die, and have strong ties and commitments to other people and to the environment in which they live. They enjoy whatever they do, even if tedious or difficult; they are hardly ever bored, and they can take in stride anything that comes their way. Perhaps their greatest strength is that they are in control of their lives. We shall see later how they have managed to reach this state. But before we do so, we need to review some of the devices that have been developed over time as
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