The Brazilian striker has been widely regarded as one of the best ever, and some quotes by current footballers might give you a hint on why.

Playing in some of the world's best leagues can't be a coincidence, and Brazilian striker Ronaldo can look back at his accomplishments today, as he turns 41.

"O Fenomeno" started his professional career with Cruzeiro, making the jump to European football in 1994. He scored 42 goals in 46 appearances with PSV Eindhoven before joining FC Barcelona, where he enjoyed success for only one season. His move to Inter Milan wasn't as successful, as his frequent injuries prevented him from showing his true skills. His career-threatening injury came in a Coppa Italia match against Lazio, in one of the most heart-breaking scenes in football history.

After leading Brazil to the 2002 WC title, Ronaldo joined Real Madrid, where he fought consistently to win La Liga & Pichichi trophies. He decided to leave in 2007 and joined Milan, where he struggled again with injuries. He spent his final days on the pitch with Corinthians, calling it quits in 2011.

His resume includes two World Cup titles, one La Liga win with Real Madrid, one UEFA Cup title with Inter Milan and a couple of Ballon D'Or trophies. Today, the world of football united to celebrate his birthday, and we'll join them with a compilation of tweets featuring quotes from colleagues, experts and fans.