All 3 Uses

disciple
in
Frankenstein - 1831 version
(Edited)

I took their word for all that they averred, and I became their disciple.
p. 41.9 *

disciple = someone who passionately believes in the teachings of another
I little expected, in this enlightened and scientific age, to find a disciple of Albertus Magnus and Paracelsus.
p. 47.6
"I am happy," said M. Waldman, "to have gained a disciple; and if your application equals your ability, I have no doubt of your success."
p. 50.5

disciple = someone who believes and helps to spread the teachings of another

Definitions:

(1) (disciple)
someone who believes and helps to spread the teachings of another

"Disciples" is sometimes used as a proper noun (capitalized) to reference the twelve disciples of Jesus.
(2) (meaning too rare to warrant focus)