Thee's and Thou's
Thee's and thou's help the reader to understand if the context is speaking to a single individual or a group. People mistakenly think that this was the way people spoke during the 1600's but that's not true. It was a way of writing when accuracy was of the utmost importance. If your Bible doesn't have thee's and thou's, it isn't the most accurate.
KJV Language & Translation
Study to shew thyself approved unto God, a workman that needeth not to be ashamed, rightly dividing the word of truth. — 2 Timothy 2:15