This is a big one that applies to ALL of us. The gemara says that if you daven and aren't answered you should daven again. קוה אל השם חזק ויאמץ לבך וקוה אל השם. Hope to haShem, strengthen your heart and hope to haShem.
Why? If HaShem is not answering your prayer - drop it! The answer is clearly no. As they say in the vernacular - deal with it.
A man says to his wife "I love you". He is thinking that he loves her because she possesses wonderful personal qualities. The next time he tells her "I love you" he is thinking about the delicious dinner she just prepared. You know, men and food. The next time he tells her "I love you" he is thinking about her physical beauty. Oh, men, how superficial we can be... But that is what he is thinking about. The next time he says "I love you" he is thinking about the huge favor she did for him yesterday by running an errand so that he could be free to watch a VERY important football game on television. He understands that she thinks the game is just that - a game - but she appreciates that for him the game is very crucial. If his team wins they clinch a playoff spot. Such an event is ALMOST doche Shabbos.
Almost.
My point is that "I love you" can have multiple meanings and feelings behind it and the more he says it, the deeper and more expansive his love becomes.
When we daven for something we might experience a certain emotion. The next time we daven for the very same thing we may experience a completely different emotion. The third time - something else. Each time we feel something different than we did the previous times. When we have davenened repeatedly we have encompassed much about what we feel about this need and made it part of our relationship with haShem. This is why the gemara tells us to daven and daven yet again. We want to feel what we lack in many different ways thereby connecting us to the Source of all that is. Then we become worthy of having our request fulfilled.