The Pasuk says in Parashat Re'eh: "וברכך ה' אלוקיך בכל אשר תעשה"-Hashem your G-d will bless you in everything you do. Our Rabbis learn from here our obligation to put in our Hishtadlut, our effort, to accomplish what we want. Along with this obligation comes a very big test that everyone faces on a daily basis- to be able to put in the effort, yet realize the whole time that Hashem is really the One getting everything done. Hashem wants the world to run בדרך הטבע , through nature, so in order to camouflage His presence, He makes it look like we are the ones accomplishing. But in truth, it is all Hashem. The Mesilat Yesharim calls our Hishtadlut a tax to pay. Once we have fulfilled the quota, Hashem sends His blessing down. Shlomo Hamelech summed it up in a Pasuk in Mishle: "סוס מוכן ליום מלחמה" We have to get the horse ready to go out and fight in battle. An army cannot go out to war expecting a miracle. Rabbenu Bachya says that if they do, they will lose. They have to make all of the necessary preparations to fight. But the Pasuk concludes: "לה' התשועה" The victory of the war is entirely in the hands of Hashem. The'בוטח בה- one who trusts in Hashem, knows that once he puts in his effort he can feel comfortable with the knowledge that he did his part. Then, whatever happens is the will of Hashem for his best. A person should never feel that his efforts were wasted , even if he didn't see his desired results. For example, a man worked on a sale for six weeks, and then it all fell through. His time was not wasted, he paid six weeks' worth of tax, and that opened the pipeline for Hashem to send blessing when He sees fit. If a person went to three doctors and didn't yet come up with a solution for his health issue, he didn't waste his time. He did his Hishtadlut, he paid his tax, and now he should feel great knowing that he did his part. If there is ever a situation where a reasonable Hishtadlut is not possible, then the person becomes exempt from Hishtadlut, and he can totally rely on Hashem. For example, if a person had an ailment, and tried one method to cure it, yet it didn't work, and then tried another, and a third, and still no results, and the doctors say that there is nothing else to try. At that moment, the person becomes exempt from Hishtadlut, and he can totally rely on Hashem for a cure. Rabbi Yechezkel Abramsky, זכר צדיק לברכה, used to tell over the following story which happened to him. He was taken to Siberia against his will along with a group of people. They were told to remove their shoes, their jackets and their shirts. They had to walk on snow and ice for miles. The Rabbi had a condition from a very young age that he was very sensitive to the cold, and he would frequently get sick from being exposed to even moderately cold temperatures. His mother, he recalls, used to send him to school in many layers of clothing to protect him. He still had this condition now, and he knew that many people had died in Siberia from being exposed to the frigid temperatures. On his first walk on the ice, he turned to Hashem and said, "The Gemara tells us: '-הכל בידי שמים חוץ מצינים ופחים"Everything is in the hands of Heaven except for cold and hot," which means that if a person goes outside in the winter without a jacket and gets sick, he brought that upon himself. Hashem commanded us to guard our health; we are not allowed to act recklessly. The Rabbi continued. "When I had extra layers and jackets I put them on to protect myself. But now, I don't have that ability, so I am exempt from that obligation. All that is left is the בידי שמים part. Now Hashem, it is only in Your hands. Please, save me from getting cold here." The Rabbi testified, that for over a year and a half in Siberia, he never felt cold even once. It is not the clothing that warms us up, it is Hashem. When we have the ability to help ourselves, we are obligated to. But when there is nothing for us to do, we can totally rely on Hashem. Those who are able to see through nature and recognize that everything is really Hashem, will not only pass this very big test, but they will reap the rewards both in this world and in the next.