It seems we can do nothing right without God. Our souls are too weak to stand alone against the forces at work on this earth. This perhaps explains why it is said that everything bad we do comes from us, and anything good from God? On our own, in our weakness, we will inevitably make bad choices, it is only with God's strength and God's good spirit acting within us that we can be sure of doing good. Thus, if we wish to be perfectly good, this can only be achieved by resigning our will to God's will in complete obedience. This does not mean we cannot be ourselves or do what we wish, it just means that whatever we do must be with God's blessing. In any case, as I understand it pleasing God in this way is a good soul's greatest pleasure. Just as a good child takes pleasure in pleasing its parents, so a good grown soul takes pleasure in pleasing God, and others, even at its own (apparent) expense.
Thus I feel we should take no pride if we feel we are good, or have done good, but instead should give grace and thanks to God. We can however, take complete joy in loving God and others and obeying God out of such love (but never if acting out of compulsion or hope for some material benefit).
Christians who hope or aim to convert others, should also realise that on their own they may achieve little, and perhaps even do harm, unless they are acting as prompted by God, as only God knows what each person needs at each time to be gently led to Him.
In this regard consider the following from "God Calling" edited by A.J Russell:
"Follow My Guidance. Be afraid to venture on your own as a child fears to leave its mother's side. Doubt of your own wisdom, and reliance on Mine, will teach you humility.
Humility is not the belittling of the self. It is forgetting the self. Nay more, forgetting the self, because you are remembering Me.
You must not expect to live in a world where all is harmony. You must not expect to live where others are in unbroken accord with you. It is your task to maintain your own heart peace in adverse circumstances. Harmony is always yours when you strain your ear to catch Heaven's music.
Doubt always your power or wisdom to put things right, ask Me to right all as you leave it to Me, and go on your way loving and laughing. I am wisdom. Only My wisdom can rightly decide anything - settle any problem. So rely on Me. All is well."