From the Pri Etz Hadar, the first ever published seder for Tu Bishvat, circa 17th century: “speech has the power to arouse the sefirot and to cause them to shine more wondrously with a very great light that sheds abundance, favor, blessing, and benefit throughout all the worlds. Consequently, before eating each fruit, it is proper to meditate on the mystery of its divine root, as found in the Zohar and, in some cases, in the tikkunim, in order to arouse their roots above.”