Before we can hear the Lord speaking to us, we must stop speaking against Him. How can we hear what the Lord is saying to us if we keep on speaking against Him? If we are to speak for God, we must begin with listening to Him.
If we are to bring the Word of God to others, we must pray that He will speak to us. We must pray that He will give to us His Word - "the Lord put a word in Balaam's mouth" (Numbers 23:5). At the heart of our ministry of God's Word, there must be this firm conviction: "God is not a man, that He should lie or change His mind" (Numbers 23:19). Who are we to call in question the Word of the Lord? When God speaks to us, He calls us to believe His Word. We are to trust Him. If we question the Word of the Lord, and, then, attempt to speak His Word to others, we're asking for big trouble - "If the trumpet doesn't sound a clear call, who will get ready for battle?" (1 Corinthians 14:8). We do not help the people of God to triumph over Satan, if we do not speak to them the Word of the Lord.
There needs to be obedience to God's Word. This is not only speaking God's Word. It's doing what God's Word says.
There needs to be empowering by the Spirit of God. Without His power, our words will never speak to people as the Word of the living God. With His power, everything changes. It is His power that carries home His Word to the hearts of our hearers.