Perhaps nobody yet has been truthful enough about what "truthfulness" is.

Deal in truth with everyone but most importantly with yourself.

Truth is like a bright full moon in a dark country sky. Powerful, bright and undeniable. Lies are like clouds that continually try to cover that moon. Sometimes they might be able to cover the moon, but only temporarily. The truth will always outshine the clouds.

The most fatal seductive lie that has yet existed.

The love of truth has its reward in heaven and even on earth.

Nobody dies nowadays of fatal truths: there are too many antidotes to them.