Sforno on Deuteronomy 30:1/ספורנו על דברים ל׳:א׳

1והשבות אל לבבך, you will be able to distinguish the truth between apparently contradictory phenomena. When you become the victim of what has been predicted for the sinners, you will realise how far you had strayed from G’d’s Torah, i.e. from G’d Himself.

2בכל הגויים, while you are still in exile.