ייִדישער מחשבֿה אויף ירמיהו 17:6

The Mishnah in Avot Chapter three states that anyone whose theoretical knowledge is greater than the action he takes based on such knowledge is comparable to a tree whose foliage is abundant but whose roots are few. When a wind blows, it will uproot such a tree and turn it upside down as we know from Jeremiah 17,6, "He shall be like a lonely tree in the wasteland, and shall not see when good comes.” On the other hand, he whose practical deeds are greater than his theoretical knowledge is comparable to a tree of little foliage but many roots which cannot be uprooted by all the winds in the world, as is described in the verse of Jeremiah quoted.