I looked to all the different bells and after a better look I think it's Harebell (Campanula rotundifolia) I think it that becauce of the leaves you see. And it's the most commom Campanula you see in Europe.
"Nothing in this world can take the place of persistence. Talent will not; nothing is more common than unsuccessful people with talent. Genius will not; unrewarded genius is almost a proverb. Education will not; the world is full of educated derelicts. Persistence and determination alone are omnipotent. The slogan "press on" has solved and always will solve the problems of the human race."