firmly-held belief

Often the quickest road to fame is to overturn a firmly-held belief.

He then offered a twin-pronged coup de grace aimed at illustrating Antonina's insensitivity while appealing to von Meck's firmly-held belief, as the mother of 11 children, in family as the sole justification for marriage.

Clement immediately resigned from the firm, writing in a letter to King & Spalding Chairman Robert Hays, "I resign out of the firmly-held belief that a representation should not be abandoned because the client's legal position is extremely unpopular in certain quarters.