Spurgeon was no stranger to discouragement, yet he wrote,
“Affliction is God's black dog that he sends after wandering sheep to bring them back to the fold.”
One of these days you will be glad of all the rough treatment that the black dog gave you on the day of your tribulation. Thorns and thistles shall the earth bring forth to thee; but if these bring thee nearer to thy God, they are the best crop the ground can grow.
From “teachings of nature in the kingdom of grace page 34