Worry is something that ruins all Divine service. A wholesome person, however, should have a settled mind, and let him cast his burden upon Hashem (see Tehillim 55:23), and when disturbing thoughts come upon him, let him think about the love and fear of Hashem. He can imagine that he is involved in a business where he stands to gain millions, and if other people would call him away to some other place where he can earn a penny—he will certainly shout at them and tell them that he has more important business to attend to. The same applies to avodas Hashem, Divine service. Besides, if the person will “carry” the load of the Word of Hashem, then Hashem will carry the person’s load, and those who hope unto Hashem receive new strength. The Sages tell a parable in the Midrash about this about a person who lived in Teveria and owned a field in Tzippori, while there was another fellow who lived in Tzippori and owned a field in Teveria. Instead of each of them traveling to a location distant from their city, they said to each other, “You watch my field for me, and I will watch yours for you.” So, too, fear of Heaven is done here, on Earth, for “everything is in the hands of Heaven except for the fear of Heaven,” but parnassah (a livelihood) comes from Heaven. Said the Holy One: “You watch for Me” by being a God-fearing person, “and I will watch out for you” that you have your parnassah. One should see how his children are not worried about what they will live on or about anything they might need, because they count on their father—despite the fact that he is a human just like them. So,  we, who should be trusting and relying on our Father in Heaven should certainly not be preoccupied with any worry. These and similar thoughts are what one should internalize, and let him attach himself to his Creator and to His service.