When someone starts a sentence with the first half containing “I” , “not”, and “but”, the “not” should be removed and the “but” replaced with “therefore”.

Examples:

“I am not prejudiced, but”

“I will not honor you with a reply, but”

“I do not usually […], but”

—

The most infuriating is a letter that starts with:

“I do not always agree with what you say, but”

via When someone starts a sentence with the… – Nassim Nicholas Taleb | Facebook.