Prayer is not only serious business, but it’s also an expensive privilege. Why should our prayers be like the cheap temple sacrifices of which Malachi speaks, in Malachi 1:8, when Jesus had to suffer and die just to make the privilege of prayer possible? For believers to enter the Holy of Holies to speak to the Lord cost Jesus His life on the cross. It wasn’t His teaching or His miracles that tore the veil of the temple from top to bottom and opened the "new and living way" (Heb 10:20). The veil was opened because Jesus shed His blood for our sins.
To make light of prayer and take it for granted, to pray carelessly and flippantly, is to make light of the death of God’s only Son. God doesn’t answer cheap prayers. Warren Wiersbe