Дурни думкой богатеют

Stupid people dream of or believe in the realization of their groundless hopes or projects

Var.: Дурак думой богатеет Cf: As the fool thinks, so the bell clinks (Br.). Dreams give wings to fools (Am.). Fools are fain of nothing (Br.). Show him an egg and instantly the whole air is full of feathers (Br.)