The cup of a Holy Spirit inspired blessing is the most satisfying drink you can pass to another person. It has more long term value to your children than a million dollars. This Holy Spirit inspired blessing brings greater satisfaction than a cold drink on a blistering hot summer day. Some Bible scholars believe this is talking about real fruit that is ripe and golden. The word apple is a generic term for fruit and gold refers to the colour.
Silver speaks of the setting, i.e. a tree laden with ripe fruit ready to pick.
I spent the summer of 1958 preaching in the Okanagan Valley. For the first time in my life I ate tree ripened peaches and apricots. Their flavour was heavenly. Peaches and cream was my dessert of choice that summer. Positive words of blessing are like tree ripened fruit to a hungry person.