'Sure' in the Bible

But we are sure that the judgment of God is according to truth against them which commit such things.

Therefore it is of faith, that it might be by grace; to the end the promise might be sure to all the seed; not to that only which is of the law, but to that also which is of the faith of Abraham; who is the father of us all,

And I am sure that, when I come unto you, I shall come in the fulness of the blessing of the gospel of Christ.