So if none of us is good, then who is a saint?  The Apostle Paul was canonized as a saint by the Catholic church.  But what does he say about himself?  "For I know that in me (that is, in my flesh) nothing good dwells; for to will is present with me, but how to perform what is good I do not find.  For the good that I will to do, I do not do; but the evil I will not to do, that I practice.  Now if I do what I will not to do, it is no longer I who do it, but sin that dwells in me." (Rom 7:19-20 NKJV)  So he knew that like all of us, we struggle with the sin nature.  David, Moses, Peter, Paul were all used mightily of God, but they all had major flaws.  David, Moses, and Paul were all murders.  Peter was impulsive and denied Christ.  So then it isn't goodness that makes us a saint.  What does God say a saint is? 

"Do you not know that to whom you present yourselves slaves to obey, you are that one’s slaves whom you obey, whether of sin leading to death, or of obedience leading to righteousness?" (Rom. 6:16 NKJV).  What Paul is saying here in Romans is that it is a matter of choice.  Who do you choose to obey?  We all fail to do the right thing at times.  But what is it that you are choosing to do, to think, to be?  Do you want to sin?  Are you making a willful choice to do that which you know is wrong?  Do you spend your time plotting your next sinful episode?  Are you making plans to sin?  Do you lay in bed at night plotting the evil you will do, the revenge you will get on another?  Do you use others for your benefit or do you think of their welfare before your own?  Do you desire things that others have and think of how you can take it from them instead of how you might work for that thing?  Then you are a practicing sinner.  When you rehearse sins before you do them, you are practicing sin.

Psalm 141:4 (NKJV) "Do not incline my heart to any evil thing, To practice wicked works with men who work iniquity; And do not let me eat of their delicacies."

On the other hand, those who are spending their thoughts on how to stop doing wrong, who dwell on words of righteousness and how to apply them to their lives, they are practicing righteousness.  Those who find themselves grieving over the wrongs they have done and who contemplate how to stop doing that.  Those are the righteous.  When we accept Christ's sacrifice on the cross, the Holy Spirit comes to live in us.  He is the righteousness in us.  Our righteousness fails. Isaiah 64:6 (NKJV) "And all our righteousnesses are like filthy rags."

Psalm 50:5  “Gather My saints together to Me, Those who have made a covenant with Me by sacrifice.”

This psalm gives the definition of what a saint is.  It is those who have made a covenant according to His sacrifice.  There is no one perfect, no one who has become sinless.  If we could be perfect, then Jesus would not have to die in our place.  But we cannot.  Paul couldn't. Moses couldn't.  David didn't.  We have all sinned.  We sin because of the fallen nature of this world and our inheritance from Adam.  But we are no longer of this world.  We are heirs to a heavenly kingdom and through the power of The Holy Spirit in us, we have victory over sin.  We are no longer under the bondage of sin and the death sentence it carries.  No, we are saints when we are practicing righteousness.

1 John 3:7  "Little children, let no one deceive you. He who practices righteousness is righteous, just as He is righteous."

An old Cherokee is teaching his grandson about life. “A fight is going on inside me,” he said to the boy.  “It is a terrible fight and it is between two wolves. One is evil – he is anger, envy, sorrow, regret, greed, arrogance, self-pity, guilt, resentment, inferiority, lies, false pride, superiority, and ego.” He continued, “The other is good – he is joy, peace, love, hope, serenity, humility, kindness, benevolence, empathy, generosity, truth, compassion, and faith. The same fight is going on inside you – and inside every other person, too.”

The grandson thought about it for a minute and then asked his grandfather, “Which wolf will win?”

The old Cherokee simply replied, “The one you feed.”

When you are saved and the Holy Spirit dwells in you, He gives you His fruit as stated in Galatians 5:22-23:  Love, Joy, Peace, Patience, Kindness, Goodness, Gentleness, and Self-Control.  Whether or not you walk in the in those things is your choice.