“Know thyself! From this Socratic precept engraved on the pediment of the temple at Delphi, we learn that self-knowledge is the basis of wisdom.
Individual and collective self-awareness as a catalyst for learning and development
Dimensions refer to the idea that everyone has different levels of personal styles and competencies. For example, extraversion is a dimension because people are not either extroverted or not but are more or less introverted along a continuum.
https://en.wikipedia.org/wiki/Dimensional_models_of_personality_disorders