These two phrases have done the most damage to the Ummah: "no one can judge me" and "focus on yourself"

"No one can judge me" is a statement of irja'. The Prophet PBUH said that murji'ah (postponers of judgement) and qadariyyah (those who deny Allah's absolute power over fate) will be turned away at his Pond (Hawd) on the Day of Judgement

In another hadith, he says that the most hateful speech in the sight of Allah is when someone responds to "fear Allah" with "focus on yourself"