Mark Alan Ruffalo, popularly known as Mark Ruffalo, is a celebrity who is popular for his diverse interests in several fields.

Besides being a well-known Hollywood actor, Ruffalo is also a director, humanitarian and producer who has numerous accolades and praises for his work and activities.

Ruffalo is best known for his portrayal of Marvel Comic character Dr. Bruce Banner a.k.a. The Hulk in "The Avengers" (2012) and "Avengers: Age of Ultron" (2015).

As the 48-year-old actor celebrates his birthday today, here are some of his most famous quotes.

"I think we've all been kind of... everyone's been hurt, everyone's felt loss, everyone has exultation, everyone has a need to be loved, or to have lost love, so when you play a character, you're pulling out those little threads and turning them up a bit."

"People use the Method as a shield; it shields them from being vulnerable. I hear all these young actors who are like, 'I'm Method, I'm gonna go live in the house, you know, I totally get it, I've done it, I've been there', but one thing I know is it kills spontaneity."

"But, the relationships that I see work - As long as they're telling the truth, and saying the things that you don't ever want to have to say to another human being."

"I think of marriage as a garden. You have to tend to it. Respect it, take care of it, feed it. Make sure everyone is getting the right amount of, um, sunlight."

"Certainly, it's very easy to fall in love with cash. If you're going to make all your decisions based on cash, you're going to have a pretty nasty career."

"I don't know, one out of every two marriages ends up in divorce so there's a lot of great people out there who people aren't happy with."

Source: Brainy Quote