"Let him not be discouraged if his income is denied him on occasion, let him trust in GD that He will provide him with his livelihood all his life" pg395 Nefesh Hachaim "Chana was speaking in her heart" when one prays he must direct his thoughts to Heaven Gate Two Chapter 1 page 77

People were created with predisposed interests and abilities. These should not be ignored they are GD given to allow him to fulfil his purpose and Tikun. He should pursue these interest and talents and make a Parnasa from them.   pg 395 Nefesh Hachaim   The first step to achieving "Prayer with all your heart" is to expel all foreign thoughts from your mind.  This must be accompanied by an understanding and concentration on the words of the Tefilah.   Gate 2 chapter 1 pg 77