Follow his advice... "The Tibetan Book of the Death" is a nice place to start.

One of the main reasons Yogi's Meditate is to overcome that circle called "Samsara", the endless round of birth, death, and rebirth to which all conditioned beings are subject. According to the view of many Indian Religions, our current life is only one of many—stretching back before birth into past existences and reaching forward beyond death into future incarnations. During the course of each life, the quality of the actions (karma) performed determine the future destiny of each person.

Pro tip: My Guru stated that if one surrenders, and Meditates deeply, no matter what actions one has performed in the past, one can become free from that circle and attain liberation...

https://en.wikipedia.org/wiki/Sa%E1%B9%83s%C4%81ra