Jeremiah 1:19

And they shall fight against thee, a fact of which Jeremiah was to be aware from the outset, but they shall not prevail against thee; for I am with thee, saith the Lord, to deliver thee, this assurance serving as the source of the prophet's strength in the coming trials. It has happened more than once in the history of the Church that practically a single man was obliged to stand against the enmity of the mighty ones of the earth and of the masses of people as well, but that he maintained his righteous cause in the power of the Lord.