This is so encouraging.. It's hard to remember this when reading about their lives but those stories told by John Bosco about when he was a boy just shows how true the above is. And how the saints help others to become saints like in the case of Jean Vianney with his great devotion to St Philomena obtaining for him so many graces that he too became a saint.
Every one in heaven is a saint so if that's where we want to go, that's what we have to become.
For men this is impossible, but with God all things are possible.