I've heard the cliche more than a few times. Some people are so heavenly minded they are of no earthly good.
But that does not fit Catholic theology in the least.
Those who truly have their eyes on the prize (heaven) know what it takes. They are familiar with Our Lord's words. Feed, clothe, visit, nurse those who are considered the neediest and you do it for Jesus Christ himself.
And those of you who forgot to feed the poor, clothe the naked, visit the imprisoned, or nurse the sick, well you don't get in. No heavenly rest. No celestial reward. You get eternal damnation.
I didn't make it up. Don't blame me.
So really, to be truly heavenly minded, one must be about the business of doing the most earthly good. For whatever we do for the least of these, we do for Jesus Christ himself.
Go and be so heavenly minded that you cannot help but be of the greatest earthly good.