Tefillah

The Sefer HaChinuch writes that through the Mitzvah of Tefillah, Hashem “made Klal Yisroel know and opened an opening for them such that they attain all of their requests for the good – and that is that they request them from Him, blessed be He – since the wherewithal and ability to provide for all they lack is in His hand; as He will have the heavens answer ‘to all that call Him in truth,’ …and that there is no prevention and impediment in front of Him for anything He desires.”