set store by (something or someone)
To have faith, confidence, or belief in someone or something; to care about, appreciate, or respect someone or something. It is important that one sets store by one's friends, for it is to them one must turn when life becomes difficult. My brother is not one to set store by obeying social rules or etiquette.
set store by
Also, set great store by. Regard as valuable or worthwhile, as in I don't set much store by her judgment, or He sets great store by his good name. The word store here is used in the sense of "something precious," a usage that is obsolete except in these terms.
set (or lay or put) store by (or on)
consider something to be of a particular degree of importance or value. set store by
To regard as valuable or worthwhile.