Today I was reading in Mosiah 21 and one of the verses caught my attention. It was in verse 6 and reads, "And it came to pass that the people began to murmur with the king because of their afflictions; and they began to be desirous to go against them to battle. And they did afflict the king sorely with their complaints; therefore he granted unto them that they should do according to their desires." This verse made me think of us when we ask the Lord for things over and over again, even when we know the answer. The Lord loves us and will grant unto us our desires but...do we really want that? There are examples throughout The Book of Mormon that show that we probably don't always really want what we ask for. Some of those examples are from those who asked for a sign 'they would believe if only they had a sign'. Well they eventually received their signs- being struck dumb, being destroyed through the fulfilment of a sign and so on. Side note: Signs are a whole different topic but, signs don't benefit anyone anything, for if we will only believe if we have a sign wherein lies our conversion? Ok back to the topic. Others asked for things that weren't necessarily bad but had negative repercussions. 
The Lord knows what is best for us and what will benefit us the most. He knows what we need and we only think we know what we need. "Wherefore, brethren, seek not to ^acounsel the Lord, but to take counsel from his hand. For behold, ye yourselves know that he counseleth in ^bwisdom, and in justice, and in great mercy, over all his works" (Jacob 4:10). Take the answers that come and learn what is needed and always seek that which will bring you closer to our Savior. Make your desires that of righteousness. Follow and make your will His will.