Insist on is a term that implies a strong DEMAND or requirement. It can be expressed in various ways, such as requiring, demanding, urging, exacting, and emphasizing. These words all have different connotations, but they all express the idea of insisting on something. REQUIRE is the most direct way of expressing this idea, while DEMAND implies a stronger sense of urgency. URGE implies a more gentle approach, while exacting implies a more precise DEMAND. Finally, emphasize implies an even stronger sense of insistence.