"Chosen" gives no guarantee against falling from grace.

Then he said to the multitudes that came out to be baptized by him, “Brood of vipers! Who warned you to flee from the wrath to come? Therefore bear fruits worthy of repentance, and do not begin to say to yourselves, ‘We have Abraham as our father.’ For I say to you that God is able to raise up children to Abraham from these stones. And even now the ax is laid to the root of the trees. Therefore every tree which does not bear good fruit is cut down and thrown into the fire.” So the people asked him, saying, “What shall we do then?” He answered and said to them, “He who has two tunics, let him give to him who has none; and he who has food, let him do likewise.” (Luke 3:7-11 NKJV)

John is speaking against systemic pride, against the habitual citation of blessings & promises over actual righteousness. The Jews were absolutely certain they were the best, the favored, the chosen ones. And they were--right up until they chose evil over good. 

I never want to fall into that all-too-alluring trap, to ease into the seductive trance of "all is well" and "we are the chosen" that lulls the conscience to sleep. 

Father in Heaven, keep my eyes ever bright before Thee, so I might see myself as You see me, both the reality of my flaws & sins, and the covering of grace that makes me whole in Your sight. Let me walk in repentance straight for you, not turning away or tacking to and for, double-minded and miserable. I love you so, and I long for Your presence. In Jesus' glorified name, Amen.