Usage of に in the following sentence There are two sentences using following that are confusing to me (both from Wanikani). > (I survive on the warmth of humanity) and > (Koichi-sama is such a wonderful person with deep empathy, but Viet is such a devilish yakuza with not one atom of humanity.) My guess is either indication or purpose (but / are not verbs), or indication of location (not sure if abstract location like 'humanity' is possible).

The first is a marker for the "doer" of a passive verb. is the passive form of the transitive verb ("to keep someone alive").

> ****
> I am kept alive **by** the warmth of humanity.

The second is "(filled) with" or "(full) of". It's one of the particles you can use with , , etc. Both and are used, but the former tends to be used with intangible things like , , etc.

> ****
> Mr. Koichi is a wonderful person **full of** humanity.