Translation:

209. If ye backslide after the clear (signs) have come to you then know that Allah is Exalted in Power Wise.

Notes (Tafseer)

230. If you backslide after the conviction has been brought home to you, you may cause some inconvenience to the Cause, or to those who counted upon you, but do not be so arrogant as to suppose that you will defeat God's Power and Wisdom. The loss will be your own.