One of the reasons that students struggle in the humanities is that they are seeking scientific certainty. We have true knowledge in the humanities, but it is very different from truth in science.
When you come across something that you understand in history, the arts, and literature, do not seal it away in a box. These truths are living; they must breathe.
These ideas are mid-flight, like the pieces of a hanging mobile from the artist Alexander Calder (Untitled Mobile, 1976, National Gallery of Art). His mobiles are light, airy, fanciful creations. They are held together by principles not immediately grasped by the viewer. And, as you move around them, the relationships between the shapes seem to change, making what seemed true moments before again an enigma.