Student or Learner
The question then naturally arises: If Truth is one, whence arises this many which we experience through the senses?
(Brahma Sutras; According to Sri Sankara by Swami Vireswarananda)
Shouldn't it by any chance be 'these'?many
b) (as pronoun; functioning as plural)
many are seated already
(Collins English Dictionary)
I've no idea what the sentence means, but it's grammatically correct.
'Many' has a noun form meaning 'lot of'.
'I can't imagine why this many (people) are queueing for the bus.'