Our "Ego" - one can also call it the "Self" - consists of two parts. A lower part, called the "Ego-Self" and a higher part, the so called "Higher Self". The higher self is the part of the self, which stays throughout all incarnations. The lower and the higher self are interconnected. When we talk about "Self-Development", we mean the further development of the lower as well as the higher self.
This self-development happens with or without our conscious contribution. Those who want to raise above the common (slow) stream of evolution, must set conscious actions to speed up this development.
There are many possibilites, to speed up ones self-development. All paths of education offered by uns are exceptionally appropriate for this purpose. Each of you may pick and chose your personal approach according to your affinities and liking, You will learn to better understand yourself and the people around. You will also learn about your weaknesses. With a bit of courage for self-awareness and some consequence in implementing, you will be able easily to work on your weaknesses. So you will progress on your path of development one step after the other.