Building people up represents helping them become mature and strong in their faith. This can be stated in active form. See how you translated "builds up" in [1 Corinthians 8:1](../08/01.md). AT: "the other person is not strengthened" or "what you say does not strengthen any outsider who might hear you" (See: [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/figs-activepassive]])
Paul was not counting words, but used exaggeration to emphasize that a few understandable words are far more valuable than even a great number of words in a language that people cannot understand. AT: "10,000 words" or "a great many words" (See: [[rc://en/ta/man/translate/translate-numbers]] and [[rc://en/ta/man/translate/figs-hyperbole]])