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When Rabbi Nachman and Rabbi Yitzchak were leaving each other, Rabbi Nachman asked Rabbi Yitzchak to give him a blessing.
Rabbi Yitzchak responded with a parable. A person was walking in a desert, and he was hungry, tired, and thirsty. He happened upon a tree which had sweet fruits, a pleasing shade and a spring of water flowing beneath it. The man ate from the fruits, drank the water, and sat in its shade. When he was leaving the tree, he pondered as to how he can bless the tree. He could not bless the tree that its fruits should be sweet, its shade should be nice or that it should have a stream of water flowing beneath it since it already possessed all these things.
The blessing he gave was that it should be the will of Hashem that all the shoots planted from this tree should be just like it. Rabbi Yitzchak explained to Rabbi Nachman that he cannot bless him with Torah, riches, or children since he already had all that. Rabbi Yitzchak blessed Rabbi Nachman that all his children should be just like him.
This famous (and by now hackneyed) B'rachah in our days has taken on an ecological twist with the rain forests being denuded so we revisit the issue of blessings and the modern miracle of Israel's desalination plant and how we might rethink our age old prayers and petitions for rain knowing what is happening to our weather and climate change.