before e, æ, œ, i or y as English ksh sound in bikeshed; for example excélsis (ek-SHELL-sees)
Before any other sounds, Latin XC is like English xc in excuse.
(Latin X is otherwise like English fox)
cf. Liber usualis
Reason is by study, labor, and exercise of logic, philosophy, and other liberal arts corroborated and quickened; and the judgment both in them and also in orators, laws, and stories much ripened. And although poets are with many men taken but for painted words, yet do they much help the judgment, and make a man among other things well furnished in one special thing, without which all learning is half lame…a good mother wit.- St. Thomas More