Luke 24

Luke 24: 6-7:
He is not here; he has risen! Remember how he told you, while he was still with you in Galilee: 'The Son of Man must be delivered over to the hands of sinners, be crucified and on the third day be raised again.

Athanasius of Alexandria

“Dead men cannot take effective action; their power of influence on others lasts only till the grave. Deeds and actions that energize others belong only to the living. Well, then, look at the facts in this case. The Saviour is working mightily among men, every day He is invisibly persuading numbers of people all over the world, both within and beyond the Greek-speaking world, to accept His faith and be obedient to His teaching. Can anyone, in face of this, still doubt that He has risen and lives, or rather that He is Himself the Life? Does a dead man prick the consciences of men...?”
― St. Athanasius, On the Incarnation

Luke 24:13-14:
Now behold, two of them were traveling that same day to a village called Emmaus, which was seven miles from Jerusalem.
14And they talked together of all these things which had happened.

"On The Way to Emmaus by B. Plockhorst (1825-1907)

Luke 24: 49:
"Behold, I send the promise of my Father upon you: but tarry ye...until ye be endured with power from on high."

Jesus was saying, in essence, "If you try and evangelize in your own strength, you'll fall on your face in a short time. You can't do anything for me unless you're full of the Holy Ghost.