As the proverb well says: Beware the anger of a patient man.
43. O interjection, but not oh unless it begins a sentence.
In Latin sentences of exclamation, denunciation or appeal the lower-case o is used.
O tempora, o mores temporum.
44. The first personal pronoun I wherever it occurs.
45. Emphasized words.
We stand for Liberty and Union.
This use should be avoided except for advertising display, or job work.
We call attention to our Stock of Boots, Shoes, and Furnishings.