This is an idiom for, "overcome by anger." (See: [[rc://en/ta/man/translate/figs-idiom]])
## heard these things ##
<b>heard these things <b>- This is the turning point; the sermon ends and the council reacts.
## ground their teeth ##
<b>ground their teeth <b>- This is an idiom for expressing strong anger or hatred. Can be translated as "they became so angry that they ground their teeth together". (See: [[rc://en/ta/man/translate/figs-idiom]])
## looked...up into heaven ##
"Looked...up into the sky." It appears that only Stephen saw this vision and not anyone else in the crowd.
## he saw Jesus standing ##
Note that Jesus was "standing" not "sitting" at the right hand of God. It was an honor when a king would stand to welcome a guest.
## glory of God ##
the glory or majesty of God as light. Translated as, "a bright light from God".
## Son of Man ##
Stephen is identifying Jesus by the title "Son of Man".