All of the NT is written TO and FOR the Christian. There is nothing in it that contradicts salvation by grace through faith alone, apart from any works of man. The problem is many cannot or will not study out each passage in context and seek to reconcile difficult passages. If you have 99 clear passages on eternal security, don't overturn them by one unclear passage that SEEMS to imply that you could possibly lose it - obviously that conclusion is wrong. God's Word does not contradict - it all fits together when rightly divided.