mercy connotes a constraint by pain, a response to suffering, a empathetic impulse that compels us to action.
yet God is not a God compelled to anything – He is free.
And he said, “I will make all my goodness pass before you and will proclaim before you my name ‘The LORD.’ And I will be gracious to whom I will be gracious, and will show mercy on whom I will show mercy.
and so with every merciful act grace, and every graceful act mercy, one is no less than the other.
grace, being free and unconstrained/compelled by external factors, shows itself to be the freest of gifts, and by that a reflections of the width and breath of God –
there is no limit of grace to which He can give
He gives out of His own righteous, just, holy character
and so here the future grace God promises to us is not merely for this life, but for the life to come – eternity enjoying Him. and if to enjoy Him, to have the desires of our heart stirred for Him is a grace in itself, then every day, every moment we worship Him is a grace from Him.
so praise be to God, who is eternal! whose grace supplies us all measure of joy in Him in this life, and for all days in the life to come!