Prayer is powerful, but prayer must be pure.
David makes a sobering statement. If I hold on to sin, if I cherish what God is convicting me about, if I cling to compromise, it affects my prayer life. Not because God is unwilling to forgive, but because unrepented sin dulls sensitivity and disrupts fellowship.

On the night before the cross, Jesus did not tell His disciples to strategize. He did not tell them to prepare speeches. He told them to watch and pray.
Because prayer is protection.

There is a kind of prayer that is gentle and there is a kind that groans.
Paul uses the language of childbirth to describe spiritual labor. “I labor in birth again.” That is not casual prayer. That is not routine devotion. That is travail.