Trials in life are certainly not desirable! They are not comfortable, they may cause us pain and inconvenience, but when they are brought by God into our lives there is most definitely something He wants us to learn from them!
It is crucial for every child of God to realize that satan is always on the prowl to destroy the testimony of Christians by throwing temptations into their path. The devil knows our weaknesses sometimes better than we even do! And, He will keep hitting on those areas of our life to try and make us stumble.
As Jesus sent His disciples out into a world that would be hostile to them, that would imprison them and beat them and kill them, what they needed to succeed wasn't a new car, or perfect teeth or a retirement plan. What they needed to live successfully (as God defines it) was The Comforter.
Sometimes God chooses to let us walk through the storm so that we can learn that He will never leave us or let a situation be more than we can handle with His help. And sometimes He just plain steps in and fixes everything better than you could possibly have dreamed. Sometimes it happens in a moment, sometimes after years of patient waiting. We'll never see it if we don't let Him work, if we don't step back in faith and let God be God.