Grab those apples

The following is an excerpt from an email from the Chofetz Chaim Heritage foundation.
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A Torah scholar once posed the following question: If one has failed to concentrate while reciting the Shemoneh Esrei prayer and finds himself near its conclusion, with what approach can he inspire himself to pray the remainder of the prayer with proper concentration? The scholar offered a solution by way of a parable:
A young girl was standing in the marketplace with a large basket of apples for sale. Suddenly, a thief approached and began to snatch apples out of the basket. The girl became confused and stood helplessly, not knowing what to do. Someone who was watching from a distance called out to her, “Why are you standing still? What are you waiting for —that he should grab everything? Just as he is grabbing, so should you grab- whatever you can get will still be yours!”
And so it is regarding prayer. If one was overcome by lethargy and mindless daydreaming at the start of the Shemoneh Esrei, and suddenly finds himself near the prayer’s end without having “grabbed any apples,” this does not mean that he should give up and leave himself with nothing. Rather, he should strive with all his inner strength to concentrate on the remaining blessings.