אגרת הקדש סימן ח
This letter explains how giving Tzedaka affects the success of one’s efforts in Tefilla to feel greater closeness with the Ein Sof.
He explains Reb Eliezer’s practice of giving Tzedaka and his reference to the Possuk אני בצדק אחזה פניך in the above light.
He explains that this revelation is higher even than עולם הבא and reaches the person even now because of the principal of זורע צדקות מצמיח ישועות what you get for giving Tzedaka is based on what grows from the gift which is far more than the gift itself.
