James wrote this verse as part of a letter to be sent to Christians living in his day who had been scattered under persecution (see Acts 8 for some history). Every day was hard for them. And James challenges them to do the impossible – to count their hard season as a positive.
God “tests” your faith with a view toward growing your faith. He leads you to the limit, allowing various circumstances in your life that require your faith to grow so that, on the other side of the testing, you’re stronger than ever.
The truth is, you’ll never become all that God has in mind for you to become unless you walk through fire. Do you want God’s very best blessings poured out into your life badly enough to walk through the fire?