There is no doubt that prayer for the salvation of others is well within the will of God. Other requests may be doubtful. This type of prayer is never doubtful. When one engages in intercession for the salvation of the unsaved, one may be sure beyond the shadow of a doubt that his is God’s will. And being the will of God, prayers are right and proper, and one shall, in God’s good time, see its fulfillment.
Prayer is fulfilled in the “fullness of time.” God hears and moves at the appropriate time to complete the petition that came before him.
4 But when the fulness of the time was come, God sent forth his Son, made of a woman, made under the law, 5 To redeem them that were under the law, that we might receive the adoption of sons. Galatians 4:4-5 KJV