In practical terms. Say a farmer needed his crop to produce by next season. It is his obligation to do everything possible for that to happen. He must, plow, sow, water it and so on. All the while Rabbenu Bachya writes" Rely on the Creator, may He be exalted to make it fertile protect it from disaster, increase it's yield and bless it." This goes for any occupation, and any endeavor. For H'shem to put His Siyat Dishmaya into it there first must be and effort, a conduit in which H'shem can send the Bracha and that is through him starting the process all the while knowing it is only H'shem that can make him successful.
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pg405
