God blesses some, and not others, so that those who are blessed might be a blessing for those who are not blessed. In this way the blessed learn generosity and compassion, and the unblessed learn gratitude and holy charity. God makes some rich, and others poor, so that those rich might share their wealth with the poor ones. God makes some healthy and strong, and others sickly and weak, so that the strong might be strong for the sake of the weak, and the weak might find strength through the sharing of the strong.
In others words, God wants the salvation of all, and so He chooses some - even only a few - so that they might donate the gifts of their election - they might become as the unchosen - so that those unchosen might receive the gifts of the chosen, and thus become chosen. This is what Jesus - God the Son made man - did. He, the chosen one, became as a sinner, and died as a sinner, so that all the unchosen ones, all of us, might by His grace overabundantly given, His life-blood out-poured into the earth, might become chosen, and sons and daughters by adoption.
In the economy of God, then, the saved become debtors: the saved ones are given a cross on which to die to themselves in order to live in Christ, on-mission, on His mission to the lost of this world.
In the economy of God, He wills blessings for all! But He works it in such a way as to draw human hearts into His Heart of mercy and love. He “distributes” His blessings in a way intended to draw all into His will. Thus all come to learn a “theology of the body” - when one member suffers, all suffer; when one member is blessed, the whole body shares the blessing, and the whole body - and thus all humanity - might come into the beatitude of God’s intention.