I was born to, and raised in, a Christian home. There was a common prayer we used to recite just before we went to bed, that went like this:
Now I lay me down to sleep
I pray the Lord my soul to keep
If I should die before I wake
I pray the Lord my sould to take.
Here we are, talking to the supreme being and creator of the universe, and out of everything we could possibly say, we request an insurance policy in case we die.
As innocuous as this sounds, it is very dangerous to put thoughts like this in your head, especially when you recite it every night as a young child. I'm not saying it's not a good outcome, but to wish it like this puts something into the universe that you don't want there. This extreme negativity, in some cosmic way, becomes a subtle tropism--an orientation--for the rest of your thoughts, assumptions, beliefs, and ultimately behaviour.
Some people chronically enter a situation focusing on the worst. If they embark on an exciting trip, they say to themselves, "I sure hope I don't crash." When they turn off the lights at night, they say to themselves, "I hope somebody doesn't break in." This perspective is poisonous, because although you negate the effect in your wish, it's still becomes the object of consideration. Do you think, when Steve Jobs launched the iPhone, he said to himself, "I sure hope this iPhone thing doesn't flop!"
Instead, focus on the positive. This may be the first time you've heard this, or maybe you've heard it a thousand times. It doesn't matter, you can't forget must remember it. Effective people visualize what they want, not what they don't want. They wish for things to come true, not for backup plans in case things don't work out.
The Lord has a lot on his agenda. Next time you whisper a prayer, make it count.