If someone who is God-fearing and does not know Hebrew approaches you…tell him that he should learn the services in a language that he understands.  Prayer is nothing but the heart’s communication.  If the heart does not understand what the mouth utters, what good is it? It is therefore best to pray in a language that one understands. ~ R’ Yehudah HeChasid in Sefer Chasidim as quoted by R’ Aryeh Kaplan zt”l