Apple CEO Tim Cook took to Twitter this morning to honor the co-founder, Steve Jobs’, sixtieth birthday. Honoring his friend and mentor, Cook tweeted out a quote from Jobs’ emotional commencement address at Stanford University in 2005, in which he said “the only way to do great work is to love what you do.”

Remembering Steve, who would have turned 60 today. “The only way to do great work is to love what you do.” pic.twitter.com/0YD0gZ7jvm

— Tim Cook (@tim_cook) February 24, 2015

Jobs was born on February 24th, 1955 and passed away on October 5th, 2011, the day the iPhone 4s was announced. Jobs fought years of a rare pancreatic cancer.