O you who hears all prayer,
  to you shall all flesh come.
When iniquities prevail against me,
  you atone for our transgressions.
    -- Psalm 65:2-3

None is righteous, no not one;
  no one understands; no one seeks for God.
  -- Romans 3:10-11

For by the works of the law no human being will be justified in his sight, since through the law comes knowledge of sin....all have sinned and fall short of the glory of God
-- Romans 3:20, 3:23

All have sinned. There is none righteous. 

It's pretty straightforward. No matter how "in-control" things seem to be at any moment, you will not have it "all together" while you're mortal. Period. You are not somehow intrinsically "above" any sin. Quite the opposite: you are intrinsically inclined towards all sin. Every intention of the thoughts of the heart of man is "only evil continually", as Genesis 6:5 mentions. 

Feeling uncomfortable yet? Good.

The Christian life and walk leaves no room for complacency. As I've been taught recently, there are two kinds of Christians: those who are growing and those who are deteriorating. 

You will stumble, and for that God's grace is sufficient. But may it never be that we "continue in sin that grace may abound"! (Romans 6:1)

We must constantly strive to glorify our God, to honor Him and to cling fast to His statutes. We are to add to our faith virtue, and to our virtue knowledge, and to our knowledge self-control, and to our self-control steadfastness, and to our steadfastness godliness, and to our godliness brotherly affection, and to our brotherly affection love. 

Got all that yet?

Yeah, me neither. This is why we need the grace of God. This is why we need His strength daily to walk in His way. We are to diligently seek him, not on our own power but through falling down on our faces in recognition of our fallen state and pleading for His aid, His animation in every step we take.

When Christ's power is our lifeblood, only then can our heart flow forth with righteousness rather than continual evil.