Have you heard the saying “if it doesn’t kill you, it will make you stronger? It is similar to the saying “No pain No gain”.
Well believe it or not, that is actually a very Biblical principle. God uses the difficult times, the pains and the suffering to build us up but just as importantly to help others and to do ministry, This is exactly what James, the brother of the Lord says, in the first chapter of James, "Consider it pure joy, my brothers and sisters, whenever you face trials of many kinds, 3 because you know that the testing of your faith produces perseverance. 4 Let perseverance finish its work so that you may be mature and complete, not lacking anything."
Jesus never said, "I have come that you should be happy." Actually, God is much more interested in making your life holy than He is in making you happy. Happiness is fleeting; holiness has eternal value. No pain, no gain is particularly relevent in building character. We shouldn't expect that we can avoid pain and suffering as it is inevitable. Embracing hardship and allowing God to use it to build us up and advance Godly purposes in our life makes us "mature and complete, not lacking anything." (James 1:4)