For me this is what applies here:
1 Corinthians 4:1-5 KJV
1) Let a man so account of us, as of the ministers of Christ, and stewards of the mysteries of God.
2) Moreover it is required in stewards, that a man be found faithful.
3) But with me it is a very small thing that I should be judged of you, or of man's judgment: yea, I judge not mine own self.
4)
For I know nothing by myself; yet am I not hereby justified: but he that judgeth me is the Lord.
5) Therefore judge nothing before the time, until the Lord come, who both will bring to light the hidden things of darkness, and will make manifest the counsels of the hearts: and then shall every man have praise of God.
Paul wrote here in effect that his conscience was clean, though that doesn't mean he's not doing anything wrong, rather that he's not qualified to know really, and leaves that to Jesus to judge.
So yes, I agree, to ask, can we live sinlessly, that's not the question, because we aren't even going to know. But can we walk continuously with a clear conscience, not because we are ignoring ourselves, but because our life experience is serving Jesus, living in communion with Him. Are we showing a continuous stream of good works, a sound mind, like that? Without being accused by our conscience?
Much love!
@ProDeo