The fact is that each of us are a process and are constantly changing. The scary part is that we change in part by the influence of people around us. That makes it critical that we choose our friends with great care. You can't choose your parents or other relatives and they have a huge impact on who you think you are.
When you surround yourself with individuals who are honest, capable and willing to spend time with you then you have an excellent start on becoming a person that will be successful. Of course, both you and those around you define success. That definition leads to a longterm process of goal setting which leads to the satisfaction of "success."
The heart of the situation is that we can't tell how effective we are without the aid of others to keep us informed and make suggestions. These people become a series of "mirrors" for us to use to check our performance. As our communications improve we can establish longer term goals. But as long as there is life in us we will be setting goals and attempting to reach them because life is a process and so is communication.
Here's an example: you see someone and say to yourself, "I would really like to know that person better." You set a goal for yourself to spend some time with them letting them know a little about you and at the same time learn a little about them. If they are willing, you have just learned something about yourself. Every situation can lead you to improve your communication skills leading to achievement of goals.
This is a really round about way to say that we should always be learning about communication and we should always be applying what have learned to every day life. That way, we can use those things which work and avoid those things that simple don't work for us.