"Comprehensive mitigation prevents excessive remediation which avoids arbitration and costly litigation." This is a Chopinism that I created while working as an Accessibility Specialist. I discovered that if you mitigate (prevent problems from happening) in the source format (e.g., Microsoft Word), you avoid excessive remediation (fixing problems) in the target format (e.g., Adobe PDF).
"When you make electronic documents accessible to people with disability, you often make them MORE accessible to people without disabilities." For example, when you create and format headings correctly in a Microsoft Word document to make it accessible to a screen reader user, you make the document more accessible to everyone.
"Accessibility is the ABILITY to ACCESS information or to perform the same or a similar task." This is a blended word (from access + ability) that captures the meaning of the term accessibility.
"Accessibility is the ACCESS of use; whereas, usability is the EASE of use." Often, these two terms are used interchangeably. However, there is a subtle but distinct difference between these two terms.
"You don't have to have eyes to see." While talking to a couple of blind students, I informed them that they don't always have to have eyes to see. We can see with our minds. Imagination is the process of forming images (i.e., pictures) in our minds that we do not currently see with our eyes.
"It's not a matter of eyesight; it's a matter of insight." While working with some blind people, I learned that even as a sighted person, many things that we do are not a matter of eyesight but rather a matter of insight. (e.g., cutting my hair in the back by hearing and feeling the different sounds and texture of my hair, using my hand to feel my pant belt's loops to navigate my belt to all belt loops without missing one of them, etc.)