'Certain' in the Bible

and being absolutely certain that whatever promise He is bound by He is able also to make good.

For if while we were hostile to God we were reconciled to Him through the death of His Son, it is still more certain that now that we are reconciled, we shall obtain salvation through Christ's life.

Let not him who eats certain food look down upon him who abstains from it, nor him who abstains from it find fault with him who eats it; for God has received both of them.

He who regards the day as sacred, so regards it for the Master's sake; and he who eats certain food eats it for the Master's sake, for he gives thanks to God; and he who refrains from eating it refrains for the Master's sake, and he also gives thanks to God.

As one who lives in union with the Lord Jesus, I know and am certain that in its own nature no food is 'impure'; but if people regard any food as impure, to them it is.

for Macedonia and Greece have kindly contributed a certain sum in relief of the poor among God's people, in Jerusalem.