Acts 4:29-31:
"...and grant unto thy servants, that with all boldness they may speak thy word, By stretching forth thine hand to heal; and that signs and wonders may be done by the name of thy holy child Jesus. And when they had prayed, the place was shaken where they were assembled together; and they were all filled with the Holy Ghost, and they spake the word of God with boldness."
My question: How does this "filling" referred to in the above passage compare to/differ from the initial Holy Ghost baptism infilling?