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Apple CEO Tim Cook took a moment on Twitter to remember his mentor and friend Steve Jobs on Tuesday, the day on which the late Apple co-founder would have turned 60.

“The only way to do great work is to love what you do,” Cook wrote, quoting a line from Jobs’s 2005 commencement address at Stanford University.

Jobs died of pancreatic cancer in October 2011. He had handed over the reins of the company he founded to Cook, who previously served as Apple’s chief operating officer, in August of that year. Under Cook’s leadership, the value of Apple has more than doubled, now reaching more than $750 billion.

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