The theme Homer is presenting when Odysseus has his men tie him so that he will ignore the call of the Sirens is:
With strength and planning, one can resist temptation.
In this scene, Odysseus demonstrates foresight and self-discipline by taking proactive measures to protect himself and his crew from the seductive allure of the Sirens, who lure sailors to their doom with their enchanting songs. This emphasizes the importance of preparation and the mental strength required to resist dangerous temptations.