To start a career or business venture is in essence is to take a leap of faith, since it has not been revealed to anyone which choice will lead to success and which to(Ch"V'S) failure, It is for this reason, that when choosing an occupation, one must have faith in H'shem that He will help. We must put every physical effort necessary into succeeding, simultaneously trusting and begging H'shem for prosperity.
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Nefesh Hachaim
The highest level of Tefilah is to take the soul, connect it to its corresponding letter, vowel and punctuation, and use them to connect to the heavens with every word and intention.
Gate Two, Chapter 16 pg 100