What assurance of real happiness is there in all of one's wealth, youthfulness, sons and family members? This life is tottering like a drop of water on a lotus petal. Therefore you should always serve and worship the lotus feet of Lord Krishna.
One can attain the path of liberation from material bondage only by rendering service to highly advanced spiritual personalities.
In our conditional stage, we cannot worship Radha and Krishna. Radha-Krishna-seva is for them who have developed spontaneous love for God.
There is no limit to the glory of Sri RadhaKunda. By serving Radha-kunda, one can get an opportunity to become an assistant of Srimati Radharani under the eternal guidance of the gopis.
For a materialistic person, the spirit to enjoy never goes away and for a devotee the spirit to serve never goes away.
The Reward for Service is simply that we have Served.