Kabbalah su Salmi 34:3

Even though this custom is not mentioned in the Lurianic writings, it is nevertheless a wondrous tikkun,⁹The term tikkun has two primary connotations. First, it refers to an act of rectification in which some aspect of the damaged cosmos is restored to its desired state. However, it may also mean an act of preparation in which [a] specific cosmic aspect is made ready for some subsequent development or process. In either case, the implication here is that the custom of celebrating the 15th of Shvat through eating and praising fruit has a powerful theurgic effect. The male and female sefirot, Yesod and Malkhut, that are responsible for releasing divine abundance into the world are positively effected. The ultimate desired result is the production of fine etrogim, the peri eitz hadar, which are required for the observance of Sukkot, during the following fall.on both exoteric and esoteric levels.¹⁰It rectifies and energizes Yesod above and results in abundance in nature below. For in the Palestinian Talmud, Asarah Yuhasin,¹¹J. Kiddushin. 48b. The text in Pri Eits Hadar is garbled here. the following appears.”‘Listen, humble ones, and rejoice‘¹²Psalms 34:3 R. Hizkiyah R. Kohen said in the name of Rav, ‘In the future a person will have to account for everything that his eyes saw and he did not eat. R. Elazar was concerned about this teaching and used to save poor man’s gleanings. He would eat them, each one at its time.'”¹³Each year a special Blessing is said whenever a fruit is eaten for the first time.

Rabbi Shimon said, I have been examining this verse my whole life, “My soul shall glory in Hashem; the humble shall hear of it and be glad” (Tehillim 34:3). Now the entire verse has come to pass. Surely “My soul shall glory in Hashem,” because my soul is attached to him, ablaze with him, devoted to him and strives for him. With these strivings it shall ascend to its place. “…the humble shall hear of it and be glad” means that all the righteous and the students of the holy Yeshivah and the righteous who have just arrived with the Shechinah (as in section 7) all hearken to my words and rejoice. Therefore, “O magnify Hashem with me, and let us exalt his name together” (Ibid. 4).