You form the fabric of your experience through your own beliefs and expectations. These personal ideas about yourself and the nature of reality will affect your thoughts and emotions. You take your beliefs about reality as truth, and often do not question them. They seem self explanatory. They appear in your mind as statements of fact, far too obvious for examination.
Therefore they are accepted without question too often. They are not recognized as beliefs about reality, but are instead considered characteristics of reality itself. Frequently such ideas appear indisputable, so a part of you that it does not occur to you to speculate about their validity. They become invisible assumptions, but they nevertheless color and form your personal experience.