What does the Bible say about effectual prayers?

Effectual prayers, as illustrated in the Gospel of Matthew, are characterized by their simplicity and urgency. They are requests made out of great need, such as the Canaanite woman who cried out to Jesus for mercy on her daughter. Her prayer, 'Lord, help me,' exemplifies how these pleas are both heartfelt and effective, given the believer's dependence on God's mercy. Moreover, the Lord's responses to these prayers highlight His authority and compassion, assuring us that sincere cries for help and salvation will always find favor with Him.