Davening with kavanah is difficult for most people, and this causes many to disregard and disrespect their tefillos. They think, "What value can my tefillos have? They were mumbled without kavanah!" But every tefillah is exceptional, including those said without kavanah.
The Torah (32:9) tells us, אשר העם את ויחץ האחת המחנה אל עשו יבוא אם ויאמר ,מחנות לשני ...אתו לפליטה הנשאר המחנה והיה והכהו , "He divided the people who were with him...into two camps. He said, "If Eisav comes to one camp and strikes it down, then the remaining camp shall survive."
The Chozeh of Lublin zt'l explains that Eisav is the yetzer hara, and the two camps are the heart and speech. The pasuk is saying that if the yetzer hara smites the heart, and one cannot daven with kavanah, at least salvage the other camp, which is your speech. Say the words of the tefillah, even without kavanah, because those tefillos will also be answered.
The same is said regarding Tehillim. Tzaddikim have said that one should say Tehillim, even without kavanah, because just by saying the words, one brings about salvation and blessings.
Reb Chaim Brim zt'l brought a beautiful source that tefillos, even without kavanah, are effective:
If someone says ומטר טל ותן in the summer, he must repeat the Shemonah Esrei because, in Eretz Yisrael, rain is a curse during the summer. This halachah applies even if he said ומטר טל ותן without kavanah.
How much influence can his words have? He probably has no idea what he said! Yet, it is considered a curse, and he must daven again. We see that all tefillos, including those said without kavanah, accomplish so much!
Obviously, if he can daven with kavanah, the tefillos will be far greater, but let us be aware that every good deed, even tefillah without kavanah, is cherished and accomplishes a lot.
