Security is a biblical truth whether or not one has assurance or even if one does not believe in it. Since security rests on God s guarantee, it s truthfulness, then, does not rest on one s feelings or experiences.
Assurance is the confident realization that one has eternal life.
So then, you will know them by their fruits. He must also do the will of the Father. It is speaking to those who live godly, holy lives. Therefore he may never be sure or have assurance of his salvation. Therefore, he can boast to some extent, because of his contribution to his salvation.