Haec est fides catholica; quam nisi quisque fideliter firmiterque crediderit, salvus esse non poterit
haec – this; est – is; fides – faith; catholica – catholic; quam – which; nisi – unless, except; quisque – whoever, someone (indefinite relative pron.); fideliter – faithfully; firmiter – firmly; “x”-que – and ”x”; crediderit – believe; salvus – saved; esse – to be; non – not; poterit – to be able, can
This is the catholic faith, which unless someone believe faithfully and firmly, he is not able to be saved