He told Inside United: "It's his mindset. It was not something easy. He had to pass through a lot of difficulties and he was only looking at the positive side, the positive parts. He was very positive and that is what I like.
"You know, no matter what happens in life, I've always said that it cannot rain forever, the sun will shine. And yet the sun will not shine forever, the rain will come. So just find a good balance, especially when you are a football player.
"When you have a bad day, a better day will come. It's not when you are having a bad day that you feel it will never change. It will change but it's not because you are having a good day that it will stay forever.
"Everything is temporary and you have to know how to manage that. When you are in a bad mood, take a positive. When you are in a good mood, take a positive. Just enjoy yourself and be happy, be with the people you love and always stay positive."
Onana also expressed his belief that United can go on and achieve tangible success: "I'm very happy to be here, like I said, I’m happy to be part of this family, a big group with great guys, young players, there’s some amazing ability here. It will come, you know. Principles, do your hard work, be positive and believe in yourself. It will come."