Hasidut untuk Mazmur 42:9

For the main element of life-force is received from prayer, as it is written, "A Prayer to the God of my Life." Therefore, a person must pray with all of their power, for when a person prays with all of their power, and puts their power into the letters of the prayer, then their power is renewed there, in the aspect of "they are renewed in the morning, great is your faithfulness." For faith is [also] prayer, as it is written, "and his hands were steady," which [Onkelos] translates as, "they were spread in prayer."

And this is "Avraham was old, advanced in days" (Genesis 24:1) meaning, zaken, old, as in 'one who acquired wisdom' zeh kanah chochmah, (Sifra, Kedoshim, Chapter 7 12) and one reaches the level 'days', to continue the flows of lovingkindnesses that are called 'days', through "by day Ad-nai commands God's lovingkindness" (Psalms 42:9) and "Ad-nai blessed Avraham with everything" (Genesis 24:1), that the tzadik who continues the flows needs to have the intent to include all of Israel, and to not doubt oneself at all, as if there is no one else in the world, only that the Holy Blessed One watches out for the tzadik, and blesses them in the inclusion of all Israel, even though the tzadik does not watch out for themself, and this is "and Ad-nai blessed, etc, in everything" - meaning, in the inclusion of all Israel.