What did Tim Cook say in his community letter after quitting as Apple CEO?

Tim Cook stepped down as Apple's CEO after 15 years to take "the next step in [his] journey", saying, "This isn't goodbye." In a community letter, Cook thanked Apple users, saying that for past 15 years, he has started his mornings by reading their emails. He also expressed confidence in Apple's new CEO, John Ternus, calling him a "brilliant engineer".