'Positively' in the Bible

But so that you may know that the Son of Man has the authority and power on earth to forgive sins”—He said to the paralyzed man,

He groaned and sighed deeply in His spirit and said, “Why does this generation demand a sign? I assure you and most solemnly say to you, no sign will be given to this generation!”

I assure you and most solemnly say to you, whoever does not receive and welcome the kingdom of God like a child will not enter it at all.”

for at that time there will be such tribulation as has not occurred, from the beginning of the creation which God made, until now—and never will [be again].

I assure you and most solemnly say to you, this generation [the people living when these signs and events begin] will not pass away until all these things take place.