Final answer:
The inner voice expressed in the student's statement is the Inner Critic, which is associated with negative self-assessment and comparisons to others. Cultivating positive self-talk can help mitigate the effects of the Inner Critic.
Step-by-step explanation:
The inner voice being expressed in the statement "I'll never do as well as John; he's a genius" is an example of the Inner Critic. This voice is characterized by self-doubt, negative self-assessment, and a focus on one's limitations or failures. The Inner Critic often compares unfavorably to others, as in this case where the student is comparing themselves to John and feeling inadequate. Positive self-talk and the development of an Inner Guide can help counter the effects of the Inner Critic, fostering a more supportive internal dialogue that can lead to personal growth and better academic performance.