# On Certainty

> essay by Ludwig Wittgenstein

**Wikidata**: [Q330929](https://www.wikidata.org/wiki/Q330929)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/On_Certainty)  
**Source**: https://4ort.xyz/entity/on-certainty


## References

1. Freebase Data Dumps. 2013