The Buddhist monks live a life of penance though not like Jains. They believe in truth and they also believe that The Four Truths is the path to Moksha,i.e., relief from the cycle of births and rebirths.
The four Truths are:
1. Every suffering has a cause.
2. There is cause for suffering.
3. Desire is cause for suffering.
4. If desire is stopped,suffering can be stopped.