The mourning process has been difficult for Stamos.

On Sunday, beloved television personality Bob Saget was found dead in his hotel room at the age of 65. The precise cause of Saget’s death has still not been determined, though preliminary investigations ruled out causes like drugs or foul play. In the meantime, Saget’s family and close friends have been mourning his passing, and one person it’s been especially hard for is his former co-star John Stamos.

Today will be the hardest day of my life. God, grant me the serenity to accept the things I cannot change, ⁰courage to change the things I can, ⁰and wisdom to know the difference.

— John Stamos (@JohnStamos) January 14, 2022

“The mornings are hard. Middle of day comes in waves. Mostly bad. Nighttime is hard,” Stamos tweeted yesterday. “I miss getting a text from him right now. Me answering. Him saying he’s too tired to respond. Me saying, ‘Then why’d you text me so early?'”

John Stamos Says 'Mornings Are Hard' as He Grieves Bob Saget: 'I Miss Getting a Text from Him' https://t.co/iJ6JDzJiZM

— People (@people) January 14, 2022

“I’m not ready to accept that he’s gone – I’m not going to say goodbye yet,” Stamos said in a captioned photo of himself and Saget posted on his Instagram. “I’m going to imagine him out there, still on the road, doing what he loves with all his heart and humor. He’s standing on stage, killing! Another two-hour set in front of a couple hundred of the luckiest people on the planet. They’re laughing so hard, they weep.”

“I’m just not ready to say goodbye yet. Maybe tomorrow. Maybe.”