The enemy, Satan, can put many trials in the path of Christians. But Philippians 4:13 assures us that we can do all things, overcome any trial, with the help of of Jesus Christ, Who strengthens us.
Romans 8:35 lists seven things that can, and do, pose great trials for Christians.
John Paul Jones goes through this list and shows that the thing that will see all of us through is TRUST in the One Who called us to success, not failure.
Related reading:
Transforming Your Life: The Process of Conversion
Tools For Spiritual Growth