Learn Swedish: Att resa vidgar toleransen för andra kulturer. - Travelling broadens tolerance for other cultures.

In Swedish, uncountable abstract nouns like tolerans, kärlek (love), and frihet (freedom) take the definite suffix when you are talking about them in a general, universal sense.

English uses the "-ing" form ("travelling") here. Why does Swedish use the infinitive att resa?

Swedish doesn't have a direct equivalent to the English gerund (the "-ing" form acting as a noun). When an action is the subject of a sentence, Swedish almost always uses the infinitive form, usually preceded by att (literally "to travel").

Could I use breddar instead of vidgar to mean "broadens"?

Yes, breddar (from bred, broad) is very similar and works well for abstract concepts like knowledge. However, vidgar (from vid, wide) is the most idiomatic choice when talking about expanding someone's views, horizons (vyer), or tolerance.

Why do we say toleransen för instead of toleransen mot (towards)?

Both can be understood, but för is the standard preposition used with nouns like tolerans and intresse (interest) when pointing to a general group or concept. Mot is usually reserved for directing actions, attitudes, or feelings toward specific individuals.