Intelligence is like a light. The more intelligent someone is, the brighter the light.
- She is one of the brightest children in the class.
- He is the most brilliant scholar in his field.
- She shines at languages.
- She outshines everyone else.
- I had a sudden flash of inspiration.
- I admired his dazzling/sparkling wit.
- He never said anything and seemed a bit dim.
- This is the work of a very dull mind.
Intelligence is like a knife or blade. The more intelligent someone is, the sharper the blade.