All the things that you believe become the window that you use to perceive the world. Everything else is a lie. Literally if you don't believe in something it becomes a lie. So, it's really important to constantly review (and not necessary believe) your believes because they define your type of life. You can be living in your own heaven or hell. Everybody is dreaming its own world through their believes in spite of their personal circumstances; so everyone has a choice. However, the truth is always going to be the truth and nobody can explain the truth using a human language; because it's always going to be distorted.
If you want to read more about this... I recommend reading "The Fifth Agreement" by Don Miguel Ruiz. You can find it in Spanish and English as well. Namaste!