Jack Osbourne has broken his silence over the death of his father Ozzy Osbourne. The 39-year-old TV personality explained to his Instagram followers on Wednesday morning that he hasn't felt the desire to post anything about his father's death because his "heart has hurt too much". "I'm gonna keep this short because he certainly hated long rambling speeches," he continued. "He was so many things to so many people, but I was so lucky and blessed to be a part of a very small group that got to call him 'Dad.' My heart is full of so much sadness and sorrow, but also so much love and gratitude. I got 14,501 days with that man and I know that is such a blessing." Jack then shared a quote from Hunter S. Thompson's book, The Proud Highway: The Saga of a Desperate Southern Gentleman, 1955-1967, because he felt it "best describes" the late Black Sabbath rocker. "Life should not be a journey to the grave with the intention of arriving safely in a pretty and well-preserved body... but rather to skid in broadside in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming, 'Wow! What a ride!'" he wrote. Jack concluded his caption by writing, "That was my dad. He lived and he lived his life fully. I love you dad." The Osbournes star's post also featured a montage of photos and clips of him and his father over the years, including a young Jack telling radio DJ Howard Stern it was "very cool" to have Ozzy as his dad, and Ozzy teaching young Jack how to bow and say "goodnight" at the end of a show. Ozzy passed away on 22 July at the age of 76. According to a death certificate obtained by The Sun on Tuesday, the Crazy Train singer died of cardiac arrest and also suffered from coronary artery disease and Parkinson's disease. On the certificate, his occupation was listed as: "Songwriter, Performer and Rock Legend." Jack's post comes exactly a week after the family attended the public funeral procession in Ozzy's Birmingham hometown. The rocker was later laid to rest next to the lake in his Buckinghamshire home during a private ceremony.