That saying is a little convoluted...Are you sure you understand what the activity at the cross was all about???
Jesus did not purchase a reward for us, Jesus purchased us...
1Co 6:19 What? know ye not that your body is the temple of the Holy Ghost which is in you, which ye have of God, and ye are not your own?
It's interesting that most Catholics seem to ignore this verse and those like it which show that believers are indwelt with the Holy Spirit...
I find it odd that you, claiming to be 'in the Spirit' do not bring this message to the other Catholics on these threads...
And it's odd to me that you find yourself in communion with those who reject the idea of the indwelling of the Spirit...But anyway;
1Co 6:20 For ye are bought with a price: therefore glorify God in your body, and in your spirit, which are God's.