In Heavenly Places: According to God's Will, March 16

 And this is the confidence that we have in him, that, if we ask any thing according to his will, he heareth us: and if we know that he hear us, whatsoever we ask, we know that we have the petitions that we desired of him. 1 John 5:14, 15.

When you pray for temporal blessings, remember that the Lord may see that it is not for your good or for His glory to give you just what you desire. But He will answer your prayer, giving you just what is best for you.

When Paul prayed that the thorn in his flesh might be removed, the Lord answered his prayer, not by removing the thorn, but by giving him grace to bear the trial. “My grace,” He said, “is sufficient for thee.” Paul rejoiced at this answer to his prayer, declaring, “Most gladly therefore will I rather glory in my infirmities, that the power of Christ may rest upon me” (2 Corinthians 12:9). When the sick pray for the recovery of health, the Lord does not always answer their prayer in just the way they desire. But even though they may not be immediately healed, He will give them that which is of far more value—grace to bear their sickness.27The Signs of the Times, November 18, 1903.

Make your requests known to your Maker. Never is one repulsed who comes to Him with a contrite heart. Not one sincere prayer is lost. Amid the anthems of the celestial choir, God hears the cries of the weakest human being. We pour out our heart's desire in our closets, we breathe a prayer as we walk by the way, and our words reach the throne of the Monarch of the universe. They may be inaudible to any human ear, but they cannot die away into silence, nor can they be lost through the activities of business that are going on. Nothing can drown the soul's desire. It rises above the din of the street, above the confusion of the multitude, to the heavenly courts. It is God to whom we are speaking, and our prayer is heard. You who feel the most unworthy, fear not to commit your case to God.28Christ's Object Lessons, 174.

There is a mighty power in prayer. Our great adversary is constantly seeking to keep the troubled soul away from God. An appeal to Heaven by the humblest saint is more to be dreaded by Satan than the decrees of cabinets or the mandates of kings.29The Signs of the Times, October 27, 1881.