In reply to Godwin:
Believing something to be true, isn't the same as knowing.
Belief, faith in something despite no evidence ie religion.
Think, a view based on your knowledge of something, which could be a little or vast.
Know, a fact, something you can corroborate.
Often politicians, senior staff of companies have their speeches and quotes legal vetted, so they can imply untruths as a fact, using language that doesn’t leave them libel.