Chasidut para sa Mga Awit 97:11

3. And joy is mainly in the heart, as is written (Ps. 4): "You gave joy in my heart." And it is impossible for the heart to rejoice, until he removes the crookedness in his heart, that he should have straightness of heart, and then he will merit to simchah, as is written (Ps. 97): "And gladness for the streaight of heart."

Or say "these are the generations of Yitzchak etc" (Gen. 25:19) and let's begin by explaining the verse "and Yitzchak sowed in the land etc and found a thousand measures/gates" (Gen. 26:12). One needs to say the hint, that behold the service of the tzadik is always to raise the Holy Shechinah, which is the last letter hey [of the name Havayah], and this is the hint in the commentary of Rashi z"l: "this estimation is for tithing" (Rashi on Genesis 26:12:4) - meaning, Yitzchak estimated himself as tithing - which is terumah, since the Text calls Terumah as Tithing in many places. Terumah is explained as Terom Hey [lit. Raise the letter Hey], and the essence of the service to the Holy Blessed Name through love and fear is the hint [of] Terumah - two from one hundred [trei mimeah] meaning, a person is obligated to bless one hundred blessings every day and one needs to bless [those blessings] in love and awe. And this is called "sowing" regarding the tzadik, that through love and awe a great light is sown within the tzadik, and this is "a light is sown for the righteous" (Ps. 97:11). And through this immediately one hundred measures are found, meaning, through every blessing that the tzadik blesses they open one gate of those Upper Hundred Gates which are called one hundred blessings, meaning, the Upper Pools, and this is "Yitzchak sowed:, as explained, and "found a hundred gates", as explained.

And Yitzchak sowed in that land and attained 100 measures (Gen. 26:12) - behold, King David PBUH said: "a light is sown for the righteous" (Ps. 97:11). One can explain that the light is sown in the tzadik's sphere, that is, the light and the holiness that are in the tzadik are like a seedling that makes fruit, since the tzadik causes the awakening of awe in all the world because of the tzadik's holiness, and the light of holiness is sown in people. "And joy for the upright in heart" - meaning, and for those, who are merely upright in heart, they have the level of joy, meaning, that all humans are joyful when they see them, yet they can't sow holy lights on others. And this is "Yitzchak sowed in that land", as we explained, he sowed awe and holiness inside people. "And he attained one hundred measures/gates" since a person is obligated to say a hundred blessings every day. And they correspond to the hundred people that died every day, and King David PBUH established one hundred blessings corresponding to them. This tzadik, sowing awe in people, is as if he was giving them life. Through this he caused a fixing to the known 100 gates, since every person has their own gate, and one who sustains a person fixes that person's specific gate.