Hope is for normal people. If you want to talk about ambitious people, then they won't hope, but work hard, even if they fail, they will find the flaw and try to improve or find the solution. They will keep repeating until they reach their destination.
We can't predict our future. Life can bring anything, anyone in front of us. We are living in an ephemeral world full of uncertainty and surprises. We can't be so sure about anything. So, if we know we are doing something good and especially for the sake of humanity then we will definitely win.