Because Christian follows Christ faithfully, they can expect to be persecuted . Physically, hunger and thirst are two of those things essential for continued survival and well being. Hunger, thirst, shelter, clothing, intimacy, etc. have all been provided by God. We must eat and drink. Shelter and clothing are essential for survival in a hostile world.
Intimacy is essential for our continued emotional well-being.
All of these things are good and wholesome, when channeled in the proper avenues. B. Jesus is saying - 1. Desire to both know and do the will of the Lord, a desire so strong that it is like the person whose throat is parched for water or whose stomach is aching for food. If so be ye have tasted that the Lord is gracious. For he satisfieth the longing soul, and filleth the hungry soul with goodness.