His will is sweet

The Lord showed him a tree. when he cast it into the waters, the water were made sweet.
Exodus 15:25

Joy and sorrow are often close companions. Just as the Israelites went from the thrill of victory at the Red Sea to the bitter water of Marah just 3 day's later (Exodus 15:22-23). Our rejoicing can quickly turn anguish.
  At Marah, the Lord told Moses to throw a tree into the water, which made it "sweet" and drinkable (v25). Another "tree," when "cast into" the bitter circumstances of our lives, can make them sweet. It is the cross of Jesus (1Peter2:24). Our outlook will be transformed as we contemplate His sacrificial death and His submission to the will of God (Luke 22:42).
  Our pain may come from the ill-will of other, or worse from their neglect. Nevertheless, our Lord has permitted it. We nay not understand why, yet it is the will of our Father and friend whose wisdom and love are infinite.
  When we say yes to God, His Spirit reveals His will to us through His word, the bitter circumstances of our lives can become sweet. We must not grumble against what the Lord permits. Instead, we are to take up our cross daily and follow Him. (Luke 9: 23).