Talking at the premiere for his new film, 'A New York Winter's Tale', at London's Kensington Odeon, he told BANG Showbiz: "I think the world would sink under the weight of its own more destructive aspects if it wasn't for love, evening the score a little bit. Whether it's love between friends, between parents and their children, lovers, whatever it may be. So yeah I do believe in the power of love."
The Hollywood star insists he isn't particularly romantic, but wasn't keen to divulge too many details about his love life.
Quizzed on the most romantic thing he's ever done, he explained: "I don't know, I'm too shy about those questions. I'm not going to talk about how romantic I am, which is just another way of saying I've never done anything romantic in my life."
Farrell admits he doesn't have any plans for Valentine's Day today (14.02.14) and is set to travel back to Los Angeles from the UK.
He sarcastically added: "[I'll be spending Valentine's Day] in a plane with 274 of my closest friends on my way to Los Angeles."
Other stars at the premiere include his co- star Jessica Brown Findlay, former 'The Only Way Is Essex' star Amy Childs and famed filmmaker J. J. Abrams.