St. Paul tells us in I Thessalonians5:17 to "pray without ceasing."
Perhaps this fairy tale from the Grimm Brothers collection can shed some light on why we should do that.
The Fox once came to a meadow in which was a flock of fine fat geese, on which he smiled and said, "I come at the nick of time, you are sitting together quite beautifully, so that I can eat you up one afte the other." The geese cackled with terror, sprang up, and began to wail and beg piteously for their lives. But the Fox would listen to nothing, and said, "There is no mercy to be had! You must die."
At length one of them took heart and said, "If we poor geese are to yield up our vigorous young lives, show us the only possible favor and allow us one more prayer, that we may not die in our sins, and then we will place ourselves in a row, so that you can always pick yourself the fattest." "Yes," said the Fox, "that is a reasonable, and a pious request. Pray away, I will wait till you are done." Then the first began a good long prayer, forever saying, "Ga! Ga!" and as she would make no end, the second did not wait until her turn came, but began also, "Ga! Ga!" The third and fourth followed her, and soon they were all cackling together.
When they have done praying, the story shall be continued further, but at present they are still praying, and they show no sign of stopping.