"A person cannot attain a true sense of taqwa unless and until he removes all suspicions from his heart." (i.e. gives up shirk, evil deeds, doubtful things, and starts doing righteous deeds regularly.)
[See Fath al-Bari, Vol. 1, p. 54]
Subhanak Allaahuma wa bihamdika ash-hadu anlaa illaaha illa anta astaghfiruka wa atubu ilayk
If I said anything correct, then it is from Allaah (subhanahu wa taa'ala), and if I erred, then that is from me and shaytan.