Thus saith the Lord, by the mouth of the prophet,

I will also leave in the midst of you an afflicted and poor people, and they shall trust in the name of the LORD. -Zephaniah 3:12

Now, why afflicted and poor? Because there is an adaptation in the afflicted and poor among the Lord’s people, to trust in the Lord. He does not say, “I will leave in the midst of thee a prosperous and rich people, and they shall trust.” No! these scarcely seem to have such capacity for faith as the afflicted ones have. Rather, “I will leave in the midst of thee an afflicted and poor people,” and they, by reason of their very affliction and poverty, shall be the more graciously disposed to repose their faith in the Lord. Untried faith is always small in stature; and it is likely to remain dwarfish so long as it is without trials. There is no room in the placid pools of ease for faith to gain leviathan proportions, she must dwell in the stormy sea if she would be one of the chief of the ways of God. Tried faith brings experience; and every one of you who are men and women of experience, must know that experience makes religion become more real to you. You never know either the bitterness of sin or the sweetness of pardon, till you have felt both. You never know your own weakness till you have been compelled to go through the rivers, and you would never have known God’s strength had you not been supported amid the water-floods. All the talk about religion which is not based upon an experience of it is mere talk. If we have little experience, we cannot speak so positively as those can whose experience has been more deep and profound. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0585.cfm