Seeing only sin

Dietrich Bonhoeffer bluntly states that:

the Lord will judge us each according to our works without partiality. For each person's works will become apparent, and to each the Lord will give "recompense for what has been done in the body, whether good or evil" (2 Cor 5:10; Rom 2:6ff; Matt 16:27). Whatever has not already received its judgment here on earth will not remain hidden on judgment day, but must come to light.

(p. 277, Discipleship)

The editor's footnotes also quote the Parable of the Sheep and the Goats (Matthew 25:31-46) as further support.

[But a] surprising point arises from the fact that in Jesus' story the sheep think they are goats and the goats are sure they are sheep. "When did we see you naked, and not clothe you?" the latter boast. To these goats, who insist on following the law (and think they get perfect marks in so doing), the king replies, "You missed one! As often as you did not do it to one of the least of these, you did not do it to me." Try living by the law, and you will be toast. On the contrary, the poor befuddled sheep [...] cannot seem to see their gifts and works at all. "When did we see you naked, etc., and clothe you?" The king answers, "I remember one time." Rather like those poor split-brained disciples of the Sermon on the Mount, whose right hand did not know what the left was doing, these people's good works sneak up on them and remain hidden from to them (but not necessarily to others) their whole life long. The only thing Christians truly sense is their desperate need for a Savior, the Good Shepherd, who seeks the lost.

(italics original, p. 93, Timothy Wengert, A Formula for Parish Practice)

Dietrich Bonhoeffer doesn't disagree. We should not respond to the doctrine of judgement by works by looking at our achievements and trusting in them.

The saints themselves are unaware of the fruit of sanctification they bear. The left hand does not know what the right hand is doing. If they become curious to know something in this matter, if they decide to engage in self-contemplation, then they would have already torn themselves away from the root and their time of bearing fruit would have passed [...] In their own lives, only the saints see strife, hardship, weakness and sin. And the more maturity they gain in the state of sanctification, the more they recognize themselves as being overcome, as those who are dying according to the flesh.

(p. 266f, Discipleship)

As I once heard Dick Lucas preach on Romans 8: the Spirit witnesses to our adoption by making us aware of the constant presence of the battle with our old nature.

But don't you know people just like that? I do. People who cheerfully give and give, but have no awareness of the good works they are doing. They're just being normal in their own eyes, or perhaps not even doing enough. But sometimes other people see how exceptional the giving is, and give thanks for them.