光说不做

all talk and no action (idiom) / to preach what one does not practice

(idiom) to be all talk and no action; to preach what one does not practice

no; not so / (bound form) not; un-

to persuade

to speak / to say / to explain / to scold / to tell off / a theory (typically the last character in a compound, as in 日心說|日心说 heliocentric theory)

variant of 說|说[shuo1]

to speak; to talk; to say / to explain; to comment / to scold; to tell off / (bound form) theory; doctrine

to make; to produce / to write; to compose / to do; to engage in; to hold (a party etc) / (of a person) to be (an intermediary, a good student etc); to become (husband and wife, friends etc) / (of a thing) to serve as; to be used for / to assume (an air or manner)

light / ray / CL:道[dao4] / bright / only / merely / to use up