Do not feel you cant change your mind when someone challenges your beliefs, it could help you to grow.
Someone will seriously challenge some of your beliefs today and you will struggle a little with this. Do not be stubborn and if this person has some good points think it over. Just because you have believed something in the past does not mean you cant evolve and move on from that. Changing your mind about this could actually help you to grow as a person and could move you forward.