When Jesus told the woman to go and "sin no more" and the Apostle Paul told the church " You are responsible for your own salvation", these two instances might put a little crimp into the idea of permanency. And to answer the 3:16 folks, better look real close at 3:5.
You interpret any verse not as a stand-alone but by context and the whole of all scripture.
I would agree with Chisos. Two things required before before one can jump on board with this saving stuff. Think very carefully what verse 5 is saying. Verse 16 uses the word (according to the HUMAN writers) begotten. It is also indicates that if you are not born of water (human womb) and if you are not born with a Spirit you don't make the grade. Some are not born from a womb, while others are not born with a spirit God may have loved the World, just not everybody in it.
Many verses are stand alone and should be taken that way. Some can be read as context.
