It is a mistake to look at someone who is self assertive and say, "It's easy for her, she has good self-esteem." One of the ways you build self-esteem is by being self-assertive when it is not easy to do so. There are always times when self-assertiveness requires courage, no matter how high your self-esteem.
Nathaniel Branden
assertiveness, psychology, self-esteem, self-knowledge