Breadth-Narrowness

In narrow streets watch out for the dagger. (Chinese Proverb)

Narrowly gathered, widely spent. (Proverb)

The most fatal illusion is the settled point of view. Since life is growth and motion, a fixed point of view kills anyone who has one. (Atkinson)

It is with narrow-souled people as with narrow-necked bottles: the less they have in them, the more noise they make in pouring it out. (Pope)

Where there is an open mind, there will always be a frontier. (Kettering)