Birth certificate theories aside, Tuesday is President Barack Obama's 54th birthday. Obama was born on Aug. 4, 1961 in Honolulu, and at age 47 he became the United States' fifth-youngest commander-in-chief. He's beaten out by Ulysses S. Grant, Bill Clinton, John F. Kennedy and Theodore Roosevelt, who was only 42 when he took office.

Last year, Obama marked his birthday with meetings and the first-ever U.S.-Africa Leaders Summit. But this year he started the celebrations early. On Saturday he took his friends out golfing at Andrews Air Force and then went to Camp David in Maryland, where he's also partied in previous years.

Take some time to honor the president on your own today by reading some of his most famous quotes, mostly serious but some fun, collected from Wikiquote, Parade and GoodReads:

"Don’t shortchange the future because of fear in the present."

"There is not a liberal America and a conservative America — there is the United States of America. There is not a Black America and a White America and Latino America and Asian America — there's the United States of America."

"The future rewards those who press on. I don't have time to feel sorry for myself. I don't have time to complain. I'm going to press on."

"No human being can truly be imprisoned if hope burns in your heart."

GettyImages-142610424 U.S. President Barack Obama acts out a part of the story while reading from the book 'Where The Wild Things Are' during the White House Easter Egg Roll on April 9, 2012 in Washington, D.C. Photo: Getty Images

"We always knew that hope is not blind optimism. It's not ignoring the enormity of the tasks ahead or the roadblocks that stand in our path. It's not sitting on the sidelines or shirking from a fight. Hope is that thing inside us that insists, despite all the evidence to the contrary, that something better awaits us if we have the courage to reach for it and to work for it and to fight for it."

"Six years into my presidency some people still say I’m arrogant, aloof, condescending. Some people are so dumb."

"Societies held together by fear and repression may offer the illusion of stability for a time, but they are built upon fault lines that will eventually tear asunder."

"A good compromise, a good piece of legislation, is like a good sentence; or a good piece of music. Everybody can recognize it. They say, 'Huh. It works. It makes sense.'"

GettyImages-156580375 In this handout image provided by the White House, U.S. President Barack Obama jokingly mimics U.S. Olympic gymnast McKayla Maroney's 'not impressed' expression while greeting members of the 2012 U.S. Olympic gymnastics teams in the Oval Office on Nov. 15, 2012. Photo: Getty Images

“The best way to not feel hopeless is to get up and do something. Don’t wait for good things to happen to you. If you go out and make some good things happen, you will fill the world with hope, you will fill yourself with hope.”

“Why can’t I just eat my waffle?”

"There’s only one thing we can be sure of, and that is the love that we have for our children, for our families, for each other. The warmth of a small child’s embrace, that is true."

"It is you, our citizens, who make the state of our union strong."

“One voice can change a room, and if one voice can change a room, then it can change a city, and if it can change a city, it can change a state, and if it change a state, it can change a nation, and if it can change a nation, it can change the world. Your voice can change the world.”

GettyImages-458183127 President Barack Obama reacts during a news conference at the James Brady Press Briefing Room of the White House on Dec. 20, 2013 in Washington, D.C. Photo: Getty Images

"If I had to name my greatest strength, I guess it would be my humility. Greatest weakness, it’s possible that I’m a little too awesome."

"We know the battle ahead will be long, but always remember that no matter what obstacles stand in our way, nothing can stand in the way of the power of millions of voices calling for change."

"Democracy cannot be imposed on any nation from the outside. Each society must search for its own path, and no path is perfect."

"All of us must recognize that education and innovation will be the currency of the 21st century."

"Four years ago, I was locked in a brutal primary battle with Hillary Clinton. Four years later, she won't stop drunk-texting me from Cartagena."

"History travels not only forwards; history can travel backwards, history can travel sideways. And securing the gains this country has made requires the vigilance of its citizens. Our rights, our freedoms -- they are not given. They must be won. They must be nurtured through struggle and discipline, and persistence and faith."