Thursday marks the sixth anniversary of the death of Apple co-founder Steve Jobs, who died of pancreatic cancer on Oct. 5, 2011 at the age of 56.

Jobs started Apple with Steve Wozniak and Ronald Wayne in 1976, but it wasn’t easy at first. Before Apple’s success, there were mistakes, downfalls and a dramatic exit by Jobs from the company. However, the company and Jobs succeeded and introduced revolutionary products like the iPhone and iPod.

Steve Jobs Quotes

“Remembering that you are going to die is the best way I know to avoid the trap of thinking you have something to lose. You are already naked. There is no reason not to follow your heart." - Stanford University Commencement speech 2005.

"Sometimes when you innovate, you make mistakes. It is best to admit them quickly, and get on with improving your other innovations." - Wall Street Journal, 1993.

“Innovation distinguishes between a leader and a follower.” -“The Innovation Secrets of Steve Jobs,” 2001.

“You can’t connect the dots looking forward; you can only connect them looking backward. So you have to trust that the dots will somehow connect in your future. You have to trust in something — your gut, destiny, life, karma, whatever. This approach has never let me down, and it has made all the difference in my life.”- Stanford University commencement speech 2005.

"Have the courage to follow your heart and your intuition. They somehow already know what you truly want to become." - Stanford University Commencement speech 2005.

"Being the richest man in the cemetery doesn't matter to me. ... Going to bed at night saying we've done something wonderful -- that's what matters to me." -1993

"My model for business is the Beatles. They were four guys who kept each other's kind of negative tendencies in check. They balanced each other, and the total was greater than the sum of the parts. That's how I see business: Great things in business are never done by one person. They're done by a team of people." CBS, 2003.

“The people who are crazy enough to think they can change the world are the ones who do.” -Apple's Think Different campaign, 1997.

Apple CEO Tim Cook went on Twitter to remember Jobs.

“Remembering Steve today. Still with us, still inspiring us,” Cook said on social media.

Others also went on Twitter to remember the Apple co-founder.

The anniversary comes after Apple opened up the Steve Jobs Theater in Cupertino, Calif. Cook remembered Jobs during the first event held at the theater last month.

“Steve meant so much to me and so much to all of us,” said an emotional Cook during the Apple event. “There's not a day that goes by that we don't think about him. Memories have especially come rushing back as we prepared for today and this event. It's taken some time, but we can now reflect on him with joy, instead of sadness. Steve's spirit and timeless philosophy on life will always be the DNA of Apple.”

Steve Jobs' Stanford Commencement Speech