I recall one time at Bible study about my doubts if I was saved or not. One of the gals said “Blessed are the poor in spirit, for they will inherit the kingdom” (Or something like that). That ties in well with the “Yes I believe - help my unbelief.”
Yep - as does the fact that Paul lamented that he did the evil he would not do and did not do the good that he would do - more poor in spirit attitude. I take it to mean that even though once we are saved, God keeps his promise to "forgive our wickedness and recognize our sins no more", we need also be aware of our problems as far as a continuing sinful nature and reflect on it. If your continued sinfulness bothers you, then you are on the right page.