When people shout, there are few reasons for doing so.
One could be to call out for the attention of a person.
Another could be out of anger in an argument.
In the 1st reading, the Lord tells His people this:
Shout with joy for Jacob!
Hail the chief of nations!
Proclaim! Praise! Shout!
“The Lord has saved His people,
the remnant of Israel!
All that shouting is done with joy and proclaiming the mercy of God.
For the Lord God has forgiven His people’s sins and loves them with an everlasting love.
But in the gospel, the Canaanite woman was shouting for Jesus’s attention, and she was so loud that even His disciples found her irritating.
But all her shouting was not in vain, as eventually Jesus granted her request.
She would have gone off shouting for joy and proclaiming wonders of God.
We don’t usually shout with joy for God’s love and mercy.
But let our lives be a profound witnessing of God’s wonderful love and may others see the joy of being God’s people.