The song "You Already Know" by Arcade Fire explores themes of time, missed opportunities, and the intricacies of love. The lyrics convey a sense of urgency, emphasizing the fleeting nature of life and the importance of seizing the moment.

In the first verse, the singer reflects on how time can pass quickly if one doesn't pay attention. The repetition of the line "Sometimes it moves so fast" emphasizes this idea. Moving slowly, or being unaware of the passing time, can cause one to miss out on meaningful experiences and moments in life.

The chorus, with its repetition of "You already know," suggests a sense of inevitability or prior understanding. It could imply that certain truths or realizations are already known within oneself but may not have been fully acknowledged or acted upon.

The second verse delves into the contrast between a fulfilling love and a troubled one. When love is right, it becomes all-consuming, even affecting one's ability to sleep. However, when love takes a negative turn, the singer questions why the other person is sad but concludes that it's time to move on.

The bridge introduces a plea to stop questioning negative emotions since the answers are already known. It implies a sort of self-awareness and encourages acceptance of one's feelings.

Overall, "You Already Know" encourages listeners to be present, aware of time passing, and to trust their instincts and emotions. It serves as a reminder to embrace the truth that already resides within oneself and to take action accordingly.