'Know' in the Bible

For I want you to know how great a struggle I have on your behalf and for those who are at Laodicea, and for all those who have not personally seen my face,

Let your speech always be with grace, as though seasoned with salt, so that you will know how you should respond to each person.

For I have sent him to you for this very purpose, that you may know about our circumstances and that he may encourage your hearts;