This verse tells us the promise that God works for our good "in all things" is reassuring. It means that no matter what circumstances we go through, there are only two conditions for God to be working all things together for our good. Their first condition is to love God, and the second condition is to be called by God's purpose.
As Christians, we may face challenges and even dangers, and we may be forced to suffer tragedies, disappointments, persecutions, and even death. We are always likely to experience tribulations when living in this fallen, groaning world, according to the Lord Jesus Himself. The Apostle Paul further informs us that all those who live godly WILL be persecuted by the world.
Nevertheless, God's unfailing assurance is that the blood of Christ has overcome sin. Regardless of the challenges we encounter in life—including dangers and tragedies—it is important to remember that those challenges and tragedies all work for the glory of God and for the eternal good of ALL, for those who love God and for those who are called according to His purpose.

Dear Heavenly Father, thank you for calling me according to Your plan and purpose for my life. This is not Your will that anyone perishes but rather that all of those who believe in the Lord Jesus Christ will be saved. We are one with Christ through grace and faith in the finished work of Jesus on the cross. Thank You, Lord, for bringing all things together so all Your great redemptive plans can be realized. Mankind will come to fulfill Your purpose for their lives. Thank You for the many times I see Your gracious hand at work in my life and in the lives of all. 
In Jesus's name I pray. Amen.