Being therefore exalted at the right hand of God, and having received from the Father the promise of the Holy Spirit, He has poured out this which you see and hear.
The “right hand” is the “good” hand in antiquity. The hand that pours out blessing, the hand that holds the sceptre, the hand that works, acts, fights. The hand is the locus of action. We do not theorize with our hands, we act with them. We do things. Jesus, seated that the right hand of the Father, does things. And He empowers us to do things too – by His Spirit. Thus, when Peter appeals to the crowd at Pentecost he doesn’t tell them God has poured out a concept or an idea. He has poured out “that which you see and hear.” Catholic Faith is still the same today. To be sure, we walk by faith and not by sight. But the fruit of our faith is still visible in the incarnate signs and acts of love we bear to the world. All these are poured out on us from Jesus, at the right hand of God.