“And this is the confidence which we have toward Him, that if we ask anything according to His will He hears us.”-I John 14

John supposes that when we pray, we first find out if our prayers are according to the will of God.  They may be according to God’s will, and yet are not answered immediately or without the persevering prayer of faith.  It is to give us courage thus to persevere and to be strong in faith that He instructs us in this way.  This gives us boldness or confidence in prayer that if we ask anything according to His will, He hears us.  It is evident that if we are uncertain whether our petitions are according to His will, we cannot have the comfort of the promise, “We know that we have the petitions which we have asked of Him.”

                                                                                                   - Andrew Murray

Make a list of the things you know are according to the will of God.  It is His will that we should be filled with the Holy Spirit, be sanctified, rejoice, grow in grace, that the church be pure, that sinners should be saved, that the Gospel should be preached everywhere, etc., etc.