If someone "falls away" in the Catholic church, can they be renewed again unto repentence?<quoted text>
The line in the 4th century Nicene Creed, "I confess one Baptism for the forgiveness of sins.." could well have its roots in this passage from Hebrews. I will tell you what I know and since this issue is extremely serious don't take my word for it. Since Baptism leaves an indelible mark on the soul it can only be performed once. The Catholic Church accepts valid Baptisms from protestant denominations. Should an individual be unsure or if it cannot be proved a valid baptism was performed then a conditional Baptism is performed with the words, "If you are not baptized..." This is not "re-Baptism" which is impossible.
These verses say that they (I.e., Hebrews, to whom the letter is written) cannot. Hebrews 10 states it again.