In God’s word we are over and over again commanded to pray. God’s institutions are not folly. Can I believe that the infinitely wise God has ordained for me an exercise which is ineffectual, and is no more than child’s play? - Charles Spurgeon
And we shouldn't believe it either. We are go to the Lord repeatededly, spend our day in prayer. We fall short of this command all our lives but that does not erase the command. Spend time in prayer today.
Rejoice evermore. Pray without ceasing. In every thing give thanks: for this is the will of God in Christ Jesus concerning you. 1 Thessalonians 5:16-18.