After James stresses that the words of believers should not both bless and curse, he gives examples from nature to teach his readers that people who honor God by worshiping him should also live in right ways.
James uses a rhetorical question to remind believers about what happens in nature. This can be expressed as a sentence. Alternate translation: "You know that a spring does not pour out both sweet water and bitter water." (See: [[rc://en/ta/man/translate/figs-rquestion]])