Citation sur Le Deutéronome 11:13

And the second level "Service" - this is the Prayer that is the center of the service of the heart as they said "and to serve God with all your heart, this is Prayer [Tefilah]" (Taanit 2a), because the heart understands and with [Prayer] it can rise to clinging to the Creator and tie itself to the Blessed One, since Tefilah comes from the expression knot/connection, to cling oneself to the Blessed Creator with a great clinging, and this hints to the knot of the tefilin of the hand to tie the thought in one's heart to the High One, and for that one needs more effort to always pray to the Holy Blessed Name that God will help that one's yetzer hara [inclination for evil] will never be separated from clinging to the Creator, because the nature of a person is that one is likely to turn [at any moment] his thoughts to the issues and preoccupations of this world.

If you will obey God’s majestic words.