Cut and pasted directly from the online version of Calvin's Insitutes, Book First, Chapter 7, para 5:
I do not dwell on this subject at present, because we will return to it again: only let us now understand that the only true faith is that which the Spirit of God seals on our hearts. Nay, the modest and teachable reader will find a sufficient reason in the promise contained in Isaiah, that all the children of the renovated Church “shall be taught of the Lord,” (Isaiah 54:13). This singular privilege God bestows on his elect only, whom he separates from the rest of mankind.
I do not dwell on this subject at present, because we will return to it again: only let us now understand that the only true faith is that which the Spirit of God seals on our hearts. Nay, the modest and teachable reader will find a sufficient reason in the promise contained in Isaiah, that all the children of the renovated Church “shall be taught of the Lord,” (Isaiah 54:13). This singular privilege God bestows on his elect only, whom he separates from the rest of mankind.