The reason Paul emphatically instructed that followers of Christ rejoice always--always--rests in the sovereignty of God. Nothing happens in the life of His child--big or small--without purpose and meaning. He does everything for His glory and our ultimate good--not good in the fluffy sense that comes with comfort. I am talking about "good" in our depths--secure, firm, peaceful, rested, trusting.
I want this truth to stand strong in my core. When the big or small crosses my tracks--the tragic or simple "dailiness"--I am desperate to rejoice in His sovereignty. In the midst of the wilderness, He satisfies with the bread of heaven (Psalm 105:40b). In the tempests of a storm, He says, "Look at my face and trust." Nothing is arbitrary--a Rock upon which to stand.