Understanding others: emotional intelligence and self-awareness.
Investing time and energies to help others will help you as well. How is it possible?
It is a great effort understanding the way you can be a person of value for others. You surely invest time and energies. You might have to overcome barriers that the other person may raise. You expose your emotions to understand other people point of views, stories and values. These efforts will improve your emotional intelligence.
The invested time and energies which will lead to emotional intelligence improvements will also work for your self-awareness. Trying to understand others will improve your evaluation and feedback techniques. These new or refined techniques will create a more framework that you will start using for your self-evaluation.