This was not the pleasant life which they dreamed of on their wedding day!

(J.R. Miller, "The Glory of the Commonplace")

"Man is born to trouble as surely as sparks fly upward!" Job 5:7

"Here on earth you will have many trials and sorrows." John 16:33

There are many crucial lessons which Christians cannot learn in the sunshine of prosperity. So the great Teacher calls us apart and shuts the doors, to keep out the light and exclude the world's noises--and then He teaches us the songs . . .
  of peace,
  of joy,
  of trust,
  of love.
Thus the painful things of life have their place in the divine training of our lives.

Many of the things our Master calls us to do or to endure, do not seem to our eyes at the time, to be the best things. Much of our life is disappointment. Sorrow comes ofttimes with . . .
  its hot tears,
  its emptyings of the heart,
  its pain,
  its bitterness.

We do not know when we set out on any bright, sunny path--into what sorrowful experiences we shall be led. A noble young man married a sweet, beautiful girl. They were very happy. Life began for them in a garden of roses. Only three bright years had passed, however, when the young wife broke down in health. Then she became an invalid, much of the time unable to leave her room. The burden has been a very heavy one for the husband, requiring continual self-denial and sacrifice, besides the grief and anxiety it has brought.

This was not the pleasant life which they dreamed of on their wedding day! They thought only of gladness and prosperity. It never occurred to them that adversity or any trouble could break into their sweet paradise.

But the Master has made no mistake. To those who have watched their lives and noted the fruit of the suffering in them, it is becoming apparent that divine love and kindness are written in all the painful lines of the long story. The young man has been growing all the years . . .
  in strength,
  in gentleness,
  in purity of spirit,
  in self-control,
  in the peace of God,
  in all manly virtues.
It seemed a strange place to make him cast his nets--into the deep waters of affliction and disappointment--but he is now drawing them full of rich and noble blessings.

"And we know that God causes all things to work together for good to those who love God, to those who are called according to His purpose!" Romans 8:28