What does the Bible say about repentance?

““Repent therefore, and turn again, that your sins may be blotted out, so that there may come times of refreshing from the presence of the Lord,”

“If we confess our sins, he is faithful and righteous to forgive us the sins and to cleanse us from all unrighteousness.”

“if my people who are called by my name will humble themselves, pray, seek my face, and turn from their wicked ways, then I will hear from heaven, will forgive their sin, and will heal their land.”

“I tell you that even so there will be more joy in heaven over one sinner who repents, than over ninety-nine righteous people who need no repentance.”