Saxon, you are referring to one incident regarding your friend. How does my believing in eternal security contradict 1 John 5:13?
I just mentioned 1 friend. There were others that I have known that were in the same condition. It is a standard answer to anyone that turns back, they were never saved in the first place. You can never know if you are saved if you follow OSAS to its logical conclusion.

The contradiction to 1 John 5:13 is that 1 John 5:13 says, without hesitation, that you may know that you have eternal life. OSAS says that anyone that turns back was never saved. How can a person that believes OSAS ever know that they are saved? You could become like my friend and many others that believed that they were saved and turn back to your old ways and OSAS says, by many that believe OSAS, that you were never saved.