An American transcendentalist theorist and essayist Ralph Waldo Emerson writes an essay entitled Self-Reliance in 1841. It is stated there that it makes someone a wholly realized person when we follow our own integrity, instincts and ideas. We should avoid conventionality and untruthful reliability. It is much wiser to be critical of oneself, one's abilities, or one's actions in a self-aware or unduly disapproving manner.
Every individual had a purpose to have faith in our own concepts because we are exceptional and unique, our skills and capabilities cannot be somewhat duplicated by anybody else.