'Certain' in the Bible

You may be certain, my brothers, that it has frequently been in my mind to come to you (but till now I was kept from it), so that I might have some fruit from you in the same way as I have had it from the other nations.

For this reason it is of faith, so that it may be through grace; and so that the word of God may be certain to all the seed; not only to that which is of the law, but to that which is of the faith of Abraham, who is the father of us all,

And being certain that God was able to keep his word.

For I am certain that not death, or life, or angels, or rulers, or things present, or things to come, or powers,

This man puts one day before another: to that man they are the same. Let every man be certain in his mind.

I am conscious of this, and am certain in the Lord Jesus, that nothing is unclean in itself; but for the man in whose opinion it is unclean, for him it is unclean.

And I myself am certain of you, brothers, that you are full of what is good, complete in all knowledge, able to give direction to one another.

For it has been the good pleasure of those of Macedonia and Achaia to send a certain amount of money for the poor among the saints at Jerusalem.

And I am certain that when I come, I will be full of the blessing of Christ.