What is the difference between 'crescit sub pondere virtus' and 'crescit sub pondere virtue'?

The English equivalent of the sentence 'crescit sub pondere virtus' means It grows under the burden of Excellence. In the Word-by-Word translation, the verb 'crescit' means '[he/she/it] grows'. The preposition 'sub' means 'under'. The noun 'pondere' means 'burden'. The noun 'virtus' means 'virtue'. The difference between the phrase 'crescit sub pondere virtus' and 'crescit sub pondere virtue' is the all-Latin phraseology of the former. The second example ends with the English Word 'virtue'instead of the Latin 'virtus'.