Dreams are endless, and not everyone is lucky enough to only have pleasant dreams. So cherish it.
Heart tree:
Buddhist language. Refers to the mental activity like the growth of trees. "Fa Yuan Zhu Lin" Volume 20: "If the body is moistened, it will sprout unparalleled buds; when the heart tree is flourishing, it will have leaves that will never wither."
Buddhist terminology means that thoughts grow like trees. Fa Yuan Zhu Lin said: "Since the heart tree is prosperous, it has luxuriant leaves that will never wither."
Excerpted from Baidu Encyclopedia.