Bodhicitta, which means awake mind, has two aspects– ultimate and relative.  Ultimate Bodhicitta is wisdom that sees the way things are, that everything arises due to causes and conditions. Relative bodhicitta is compassion. We start developing bodhicitta with the aspiration to free beings from suffering. We develop our ability to accomplish our aspirations through engaging in practice.

This is a video teaching from Lama Yeshe’s Knowledge Vault (YouTube Channel). Please click the link below to view the video.
https://www.youtube.com/watch?v=6GNTegEs74c&t=27s