Which tense should you use to discuss your own ideas or the ideas of another person?

present tense

Use present tense to state facts, to refer to perpetual or habitual actions, and to discuss your own ideas or those expressed by an author in a particular work. Also use present tense to describe action in a literary work, movie, or other fictional narrative.

To discuss your own ideas, you would need to use the first person tense (I/my/mine). To describe someone else's ideas, you would use the third person tense (he/she/it/his/hers/its).

Explanation: See answer above.