set great store by (something or someone)
To have much faith, confidence, or belief in someone or something; to very seriously care about, appreciate, or respect someone or something. It is important that one sets great store by one's friends, for it is to them one must turn when life becomes difficult. My brother is not one to set great store by obeying social rules or etiquette.
set great store by someone or something
to have positive expectations for someone or something; to have high hopes for someone or something. I set great store by my computer and its ability to help me in my work. Bill sets great store by his expensive tools.