"The impossible things can be believed," suggests that believing in the impossible is possible with enough faith and effort. The queen encourages trying, implying that effort and persistence are key to turning the impossible into possible. The idea is reinforced by the narrator's experience of practicing believing in impossible things regularly, which helped them accept and imagine the seemingly unachievable.

"It will be because you haven't tried," the queen told her. When I was your age, I tried half an hour every day ... at breakfast time I had already believed six impossible things. This quote highlights the importance of practice and perseverance. By dedicating time daily to imagining or believing in impossible things, one can expand their horizons and overcome mental barriers that seem insurmountable.