We can , Bezrat Hashem, learn a tremendously deep lesson from these blasts. This is an original Torah thought. Each person has areas in his or her service to Hashem in which they are weaker or stronger. A person might be stronger in the giving of charity, while at the same time needs improvement in setting aside more time for Torah learning. This is readily apparent. The blasts on Friday before the Sabbath can perhaps teach us this concept in a symbolic manner. How so? The field worker represents the very aspects of our lives that needs more improvement because this worker is further from his home than anyone else. He must first enter the city and then proceed to his home. Therefore, when the first blast is blown it reminds us to atleast try to improve the very areas that need the most work. The second blast represents the store keeper that's already situated in the city, yet still needs to return home. This represents the areas in which we have already begun to fix, yet still require additional improvement. The third blast represents the the person that's already home , yet he needs to also make additional preparations for the Sabbath. This represents the areas in which a person has already made tremendous strides in his service to Hashem, but as long as he is alive improvements can be further made even in those areas . A person should never be complacent and comfortable...........The 3 blasts are a wake up call in all areas of our lives .........strong or weak. These ideas can be readily found in the following statement found in Avoda Zarah 3a: " He who has prepared on the eve of Sabbath (this world), will have what to eat on the Sabbath (the world to come)." This means that a person should always strive to improve himself. The blasts help to remind us of this never ending task........Have a good shabbos