joy and pain / certainly synonymous

"I reckon that the endurance of every imaginable suffering and trial would be a small price to pay for a settled assurance, which would for ever prevent the possibility of doubt. Never mind the waves if they wash you upon this rock. Therefore, when you are tempted, 'Count it all joy' that you are tried, because you will thus receive a proof of your love, a proof of your faith, a proof of your being the true-born children of God. Trials are like a fire; they burn up nothing in us but the dross, and they make the gold all the purer. Put down the testing process as a clear gain, and, instead of being sorry about it, count it all joy when you fall into many trials, for this gives you a proof of your faith."
- charles spurgeon

Trust in the Lord with all your heart. Lean not on your own understanding. In all your ways acknowledge Him and He will make straight your paths.