let (one's) heart rule (one's) head

let (one's) heart rule (one's) head

To do something based on one's own personal desires rather than for pragmatic or practical reasons. I couldn't believe it when I heard he'd bought a sports car, but then he has always been one to let his heart rule his head. I think she knows that a relationship with him will eventually end in tears, but she's letting her heart rule her head.
See also: head, heart, let, rule

let your ˌheart rule your ˈhead

act according to what you feel rather than what you think is sensible: Don’t let your heart rule your head. I know you like him but are you sure you can really trust him?
See also: head, heart, let, rule