Do people have intrinsic value?

Do people have intrinsic value? For several years now I've worked with people with disabilities of all sorts and degrees of severity. It has made me question a lot of things and think about why people matter. There are so many external elements, positive and negative, of these peoples lives I've given consideration: the things that impact our community and others in it but is there something else underneath all these things that gives value to people? I believe they do although I cannot express why. Just by asking these questions I feel uneasy like I'm being disrespectful by discussing peoples existence like a math equation. So my question regards that weightiness I experience and where it comes from. (Could you recommend further reading?)

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