Why does Teshuvah require Vidui (confessing with words)?

From All: R Aaron Greenberg by R Aaron Greenberg.

• Published: 2016-09-21T00:00:00Z
• Duration: 16:30
• Audio: https://shiurim.yutorah.net/2016/1655/864120.MP3
• Page: https://yutorah.org/lectures/864120
• TorahApp: https://torahapp.org/share/p/YU_82627_all/e/yu%3A864120