"And we know that in all things God works for the good of those who love him, who have been called according to his purpose." NIV
"And we know that all things work together for good to them that love God, to them who are the called according to his purpose." KJV
There are definitely things in this world that are not good for us as believers. We still experience trials and sufferings. But our Lord does make the things that we experience work together for our ultimate good. What is that ultimate good? That He will bring us to Himself a holy and righteous people.
Heavenly Father, help us to remember when things get really rough, that You will take the circumstances and cause them to turn out for our good. Forgive us for fretting when trials come. Bring to our remembrance that these times are a part of the process that You have planned to make us holy and righteous. In Jesus' name we pray, Amen.