Affirmation

Noun

1. That which is affirmed; a declaration that something is true.

   "Her success was an affirmation of all her hard work."

2. A solemn pledge (to tell the truth, to bear allegiance, etc.), legally equivalent to an oath, taken by people who are forbidden to take a religious oath (such as Quakers) or otherwise prefer not to do so.
3. A form of self-forced meditation or repetition; autosuggestion.

   "Daily positive affirmations can improve self-confidence."