Happy is the man. Hezekiah was that man. See the Beatitudes. App-63.
man. Hebrew. geber.
They: i.e. the sons.
not be ashamed. Figure of speech Tapeinosis (App-6): quite the opposite.
speak. meet, whether for negotiation or for fighting.
Related Commentaries of Psalms 127:5
Psalms 127:5
5 Happy is the man that hath his quiver full of them: they shall not be ashamed, but they shall speak with the enemies in the gate.