Earlier quoted context omitted.
Something else I find encouraging, and the reason, basically, that "everything is learnable" is that all knowledge, no matter how complex, is composed of fundamentally simple parts. Just as complex tasks or complex movements are composed of many simple steps or movements. This is what makes the maxim that "you don't understand something unless you can explain it in simple terms" true.
Yes, and this has its limits. Many true experts in their fields would struggle to explain their field simply. I like to think I'm an expert in my work, but how many times have I explained to my wife what I do in simple terms, and she still has no idea what I do? Complex ideas often get distorted or lost in simple explanations.
You could explain your work to your wife in terms simple and exhaustive enough for her to fully understand. It would just take a longer time and more concentration than either of you wants to expend.