Joy in trial is not fake. Such joy comes from a deep peace, a solid reliance on God alone...Here is Garrigou-Lagrange again.....
Imbued with these same sentiments, St. Paul writes to the Philippians (4: 4) : "Rejoice in the Lord always: again, I say, rejoice. Let your modesty be known to all men. The Lord is nigh. Be nothing solicitous: but in everything, by prayer and supplication, with thanksgiving, let your petitions be made known to God. And the peace of God, which surpasseth all understanding, keep your hearts and minds in Christ Jesus."
Again, in order to exhort us to have confidence, St. Peter tells us in his First Epistle (5: 5): Be ye humbled therefore under the mighty hand of God, that He may exalt you in the time of visitation: casting all your care upon Him, for He hath care of you. Be sober and watch: because your adversary the devil, as a roaring lion, goeth about seeking whom he may devour. Whom resist ye, strong in faith: knowing that the same affliction befalls your brethren who are in the world. But the God of all grace, who hath called us into His eternal glory in Christ Jesus, after you have suffered a little, will Himself perfect you and confirm you and establish you.