Is Unconditional Security Scriptural?

Once saved and never having the opportunity to be lost again. It seems like the perfect life, right? But is this what the Scripture teaches? 

While many try to look at the merits of this Doctrine by analogies, logic, and a partial look at the totality of Scripture, what does the Bible say, or not say, about this vital issue? 

The answer affects our eternity. With an honest and open heart, let us examine the Scripture, not bound by pre-conceived notions of men and tradition.