Who is curtailing? I'm telling you what "unless" means in English.
Let us make it simple.
Do you believe that an unbaptized person is condemned?
He who believes and is baptized will be saved. [U]nless you repent you will all likewise perish. [H]e who eats my flesh and drinks my blood has eternal life, and I will raise him up at the last day. he that shall endure unto the end, the same shall be saved-- why use Human logic to contradict or complicate HIS words?
These are the Lord's very own words His very own statements, exhortations, commands.
this is not the philosophy or wisdom of men, this what God Himself has commanded.
If you were to say that these were just for a particular time and place, the same could be said about Christ's meeting with Nicodemus and where would one be, denying Jesus Christ's own words? Its just wrong to do that -- His words are clear