Hatred is inveterate anger.
— Marcus Tullius Cicero

Americans cannot realize how many chances for mental improvement they lose by their inveterate habit of keeping six conversations when there are twelve in the room.
Ernest Dimnet inveterate quote

The book borrower...proves himself to be an inveterate collector of books not so much by the fervor with which he guards his borrowed treasures...as by his failure to read these books.
— Walter Benjamin

I believe no satirist could breathe this air. If another Juvenal or Swift could rise up among us tomorrow, he would be hunted down. If you have any knowledge of our literature, and can give me the name of any man, American born and bred, who has anatomized our follies as a people, and not as this or that party; and who has escaped the foulest and most brutal slander, the most inveterate hatred and intolerant pursuit; it will be a strange name in my ears, believe me.
— Charles Dickens

Neither man nor woman can be worth anything until they have discovered that they are fools. This is the first step towards becoming either estimable or agreeable; and until it be taken there is no hope. The sooner the discovery is made the better, as there is more time and power for taking advantage of it. Sometimes the great truth is found out too late to apply to it any effectual remedy. Sometimes it is never found at all; and these form the desperate and inveterate causes of folly, self-conceit, and impertinence.
— inveterate quotation by Lord Melbourne