Small tidbits and Sparks of wisdom

If he engages in a certain occupation and does not see success, he should not become discouraged or think that his efforts were in vain. Rather, he should tell himself that it is possible that that day’s sustenance has already come to him beforehand and is already in his possession, or that it will come to him through another means. In either case, his provisions are not dependent on the visible success of his efforts, and therefore he should not lose heart when success is not apparent.
Nevertheless, he is not permitted to abandon effort. It is proper for him to continue working in the occupation he has chosen, and he should not slacken from pursuing it, provided that it suits his character, his physical ability, and is consistent with his faith and his obligations. A person must persevere in his efforts to earn a livelihood even when they do not seem to bear fruit, for his duty lies in engaging in the proper means, not in producing the result.
Together with this effort, he must place his trust in Hashem, confident that He will not forsake him, ignore him, or abandon him, but will surely provide him with his livelihood. As it is stated, Hashem is beneficent, a stronghold on the day of distress, and mindful of those who take refuge in Him.
This same principle applies to the preservation of health. A person must trust in the Creator regarding his health and illness, while at the same time making efforts to maintain his well-being through natural means that are suited to produce this result. He is obligated to protect himself from harmful conditions, such as extreme cold or heat, for failing to do so is considered negligence.
However, when circumstances arise in which a person cannot protect himself through normal means, he may cast himself upon Hashem’s protection, recognizing that the responsibility has shifted beyond his control.
Likewise, if a person becomes ill, he should make every effort to treat the illness through the generally accepted methods, as it is commanded, “and heal you shall heal.” Yet he must not rely on these methods themselves, nor believe that they possess independent power to help or harm. Rather, he should understand that all healing comes only through the will of Hashem, Who may heal through natural means, without them, or even through that which does not appear to be a means of healing.
Thus, in matters of livelihood and health alike, a person is required to act within the natural order while placing his trust entirely in the Creator, knowing that all outcomes are determined solely by Him.