Sentence:  'Oh, this fair is nothing but a chaos of noise and beggars,' I thought in <WSD>disillusionment</WSD>. 'I wonder if Western scientists, patiently enlarging the realms of knowledge for the practical good of mankind, are not more pleasing to God than these idlers who profess religion but concentrate on alms.' 
Meaning of the word marked with <WSD> tags:  A feeling of disappointment, akin to depression, arising from the realization that something is not what it was expected or believed to be, possibly accompanied by philosophical angst from having one's beliefs challenged.