Step 1: Understand self-doubt: Self-doubt is a feeling of being unsure about oneself. A person with self-doubt often thinks that he or she cannot do a task well.
Step 2: Find the cause: Self-doubt grows when a person lacks faith in his or her own worth. It also grows when the person does not trust his or her own skills and talents.
Step 3: Fill in the blanks: The first blank is 'ourselves'. The second blank is 'abilities'. The full sentence reads: Self-doubt comes when we do not have confidence in ourselves and our abilities.
Final Answer: The missing words are ourselves and abilities.