Trusting God's Plan
By asking God for specific things, we are telling him how we want him to help us, instead of trusting God's plan and acknowledging that our lives exist to suit his designs. It's not the other way around
The thing is, since God is good, his greater plan helps people in a roundabout way, it's just not in the way that we may sometimes want him to influence in our lives.
You see, that is actually one of the biggest temptations Satan uses to get people to sin, to believe that we call the shots, that miracles happen because they are "good" in our eyes, and not because they are necessary to God's plan. Our prayer does not serve to influence God, but to remind us to be humble, to rely on and trust him
Best example I would say, would be with how Satan was attempting to tempt Jesus 3 times in the desert.
I mean, you would imagine that Jesus turning a stone to bread to be a good thing, because he was hungry.
Or you could also say that Jesus jumping off of the highest point of a temple and being lifted by Angels would have done a lot prove to everyone that he is indeed the messiah, by creating a spectacle...
But Jesus did not fall for Satan's temptation. He was fasting during the time, and he knew better than to break it early. (And 'Man cannot live on bread alone'. Why focus on the superficial, when your relationship with God is much more important?)
He did not perform a spectacle because it wasn't time; such a miracle may have caused more problems or could have even accelerated hostility from the Pharisees. Essentially, he trusted the plans of the Father, and did not stray from the path set out for him. (Also, 'Do not test the Lord your God', such a miracle did not serve much of a purpose other than unprompted spectacle. Miracles are meant to accomplish God's work, not to satiate our lack of faith.)
In case you're wondering where I got that from, you can see it with many of the miracles that he performed during the early stages of his ministry: he did not want people to go around telling everyone that he was the messiah yet. He told people whom he performed miracles to keep it on the down low
Even his very first miracle, when his mother asked him to turn the terracore water into wine, he told her that it wasn't time yet. Every miracle has a time and a place, and serves a greater purpose.
