Dogmatic

Dogmatic people hold firmly to one (usually incorrect) opinion.

If we grew up watching comedy movies we may cling to the view that only comedy movies have merit.

A Republican might easily assume that a Libertarian is a quack.

Truth can be discerned by subjecting ourselves to many teachings.

We dogmatically cling to a single opinion when we have exclusively studied or lived that opinion.

Choose to learn about many good things.

Breadth is the key to a depth-filled life.