The song "The Luxury of Knowing" by Keith Urban is a heartfelt ballad about the uncertainties and complexities of love. The lyrics describe a deep connection between two people who understand each other's habits, feelings, and intentions. Keith Urban sings about the trust and honesty in his relationship, how he always means what he says, and how he is committed to staying with his partner. However, despite his unwavering love and dedication, he compares his partner to a "diesel truck" that is on the verge of losing control. He expresses concerns that his partner might change their mind about their relationship at any moment. The constant back and forth in his partner's emotions leaves him feeling unsure and without the luxury of knowing how their love will endure. The lyrics showcase the narrator's vulnerability and the delicate nature of their love. The song suggests the difficulty of remaining steadfast and secure in a relationship when one partner exhibits unpredictable behavior. Ultimately, the song conveys a sense of insecurity and the fear of losing the person he loves.