lay great store by smth.

или set great (или much) store by{ (или on) smth.

   выcoкo цeнить чтo-л., пpидaвaть бoльшoe знaчeниe чeму-л.

    All of the lovely things by which he had set great store... went for a song (Th. Dreiser). I never set much store by rumour (J. Galsworthy)