One Proper Tefillah Uplifts All Tefillos

One Proper Tefillah Uplifts All Tefillos:

It should be added that this is true not only of Torah study, the same applies to tefillah as well. Once one reaches the level of davening l’shmah, all his previous tefillos are also considered to have been l’shmah. This is as the Tanya (Kuntres Acharon) states that there is an easy rectification for tefillos uttered without concentration or with foreign thoughts in one’s head. Once one prays one tefillah with kavannah, all his tefillos from the entire year are uplifted and considered pure and perfect.