We have a collection of 3 Knowledge quotes from Muhammad Iqbal
"But inner experience is only one source of human knowledge." (ID 61069)
"It may, however, be said that the level of experience to which concepts are inapplicable cannot yield any knowledge of a universal character, for concepts alone are capable of being socialized." (ID 61255)
"Inductive reason, which alone makes man master of his environment, is an achievement; and when once born it must be reinforced by inhibiting the growth of other modes of knowledge." (ID 61257)