"How shall I be sure of this?" said Zachariah to the Angel. "For I am an old man and my wife is advanced in years."

By no means! Be sure that God is ever true, though all mankind prove false. As it is written, That thou mayest be found just in thine argument, And gain thy cause when thou contendest.

But of this be sure. In the last days grievous times will come.

you may be sure that such a man is perverted and sinning, and is self-condemned.

then be sure that the Lord knows how to deliver the godly out of temptation, and to keep the wicked (who are even now enduring punishment) for the "Day of Judgment";