But if I cast out demons by the power of God, you may be sure the kingdom of God is come unto you:

"How can I be sure of this?" Zechariah asked the angel. "For I am an old man and my wife is advanced in years."

Then indeed you may be glad and dance for joy, for be sure that your reward in Heaven will be great; for that is what their ancestors did to the Prophets.

And be sure of this, that if the master of the house had known at what hour the thief was coming, he would not have suffered his house to be broken through.

He also told the following parable to certain persons who were sure of their own goodness and looked down upon everybody else.

But whenever you see Jerusalem surrounded by armies, then be sure her desolation is not far away.

So, whenever you see all this happen, be sure the Reign of God is at hand.

Jesus said to his disciples, "Stumbling blocks are sure to come, but woe to the one through whom they come!

Even the very dust of your city, which cleaveth on us, we do wipe off against you: notwithstanding be ye sure of this, that the kingdom of God is come nigh unto you.

And Jesus also said to the crowds, "When you see a cloud rising in the west, you immediately say, 'A rainstorm is coming up,' and sure enough, it does.

And when there is a south wind blowing, you say, 'It is going to be a scorching day,' and sure enough, it is.

Then an expert in the Law got up to test him and said, "Master, what must I do to make sure of eternal life?"

And about an hour later someone else stated emphatically, "I know for sure that this man was also with him [i.e., Jesus], for he is from Galilee [too]." [Note: Peter's accent gave him away. See Matt. 26:73].

A member of the council asked him, "Good master, what must I do to make sure of eternal life?"