There is ***[self religion][1]***:

> A self religion (or self-religion) is a religious or self-improvement group which has as one of its primary aims the improvement of the self


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Also ***stoicism*** has [self-help][2] (self-improvement) ideology in it.

> The [Stoics][3] taught that destructive emotions resulted from errors in judgment, and that a sage, or person of "moral and intellectual perfection," would not suffer such emotions.
>
> Philosophy for a Stoic is not just a set of beliefs or ethical claims, it is a way of life involving constant practice and training (or askesis, see asceticism)


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A word for a person or concept that puts emphasis on self-improvement would be ***["flourishing"][4]***.

> In positive psychology, flourishing is “to live within an optimal range of human functioning, one that connotes goodness, generativity, growth, and resilience.”

Thus, ***[eudaimonia][5]*** or eudaimonism is a related concept. It is a Greek word but it is also a loan word in English. In modern psychology, it is conceptualized in six factors, one of which is **personal growth**.

> Eudaimonia, sometimes anglicized as eudaemonia or eudemonia , is a Greek word commonly translated as happiness or welfare; however, "**human flourishing**" has been proposed as a more accurate translation.
>
> Etymologically, it consists of the words "eu" ("good") and "daimōn" ("spirit"). It is a central concept in Aristotelian ethics and political philosophy, along with the terms "**aretē**", most often translated as "**virtue**" or "**excellence**", and "**phronesis**", often translated as "practical or ethical wisdom".


  [1]: http://en.wikipedia.org/wiki/Self_religion
  [2]: http://en.wikipedia.org/wiki/Self-help
  [3]: http://en.wikipedia.org/wiki/Stoicism
  [4]: http://en.wikipedia.org/wiki/Flourishing
  [5]: http://en.wikipedia.org/wiki/Eudaimonia