He took a potion and sipped it and chose his destiny through the coontrol of the burning legion
"O, never/Shall sun that morrow see!" means "The morning when Duncan leaves here will never come, because we're going to kill him tonight." "Your face, my thane, is as a book where men/May read strange matters" means "By looking at your face, everybody can see what you're thinking." The rest of the speech means "To fool everybody, you have to behave the way everybody expects you to behave. You have to make sure that the way you look, the way you act, and the way you talk all seem to be giving Duncan a friendly welcome. You have to seem harmless even though you are secretly deadly."
A dictionary is a source you can use to find definitions of words.
A thesaurus is a source you can use to find synonyms/antonyms for certain words.
These two combined can help you choose words that are not commonly used and it can improve your vocabulary range. I personally use a thesaurus way more than a dictionary to find synonyms for common words such as “good” or “smart”
