The statement "We often identify ourselves with the beliefs that we hold" means that our beliefs are closely tied to our sense of identity. In other words, the beliefs we hold about ourselves, others, and the world around us can shape how we see ourselves and our place in the world.
For example, if we strongly believe in a certain political ideology, we may identify ourselves as a supporter of that ideology and feel that it reflects an important part of our identity. Similarly, if we have strong religious beliefs, we may identify ourselves as a member of that religion and feel that it is an essential part of who we are.
Our beliefs can also influence our behavior, as we may act in ways that are consistent with our beliefs in order to maintain a sense of coherence and integrity in our self-concept. Therefore, the beliefs we hold can have a powerful impact on our sense of self and how we relate to the world around us.