self-affirmation

noun

1. the act or an instance of affirming; state of being affirmed.
2. the assertion that something exists or is true.
3. something that is affirmed; a statement or proposition that is declared to be true.
4. confirmation or ratification of the truth or validity of a prior judgment, decision, etc.
5. Law. a solemn declaration accepted instead of a statement under oath.

noun

1. the act of affirming or the state of being affirmed
2. a statement of the existence or truth of something; assertion
3. law a solemn declaration permitted on grounds of conscientious objection to taking an oath

n.early 15c., “assertion that something is true,” from Old French afermacion (14c.), from Latin affirmationem (nominative affirmatio) “an affirmation, solid assurance,” noun of action from past participle stem of affirmare (see affirm). In law, as the Quaker alternative to oath-taking, it is attested from 1690s.