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  5. There are no constraints on the human mind, no walls around ...

There are no constraints on the human mind, no walls around the human spirit, no barriers to our progress except those we ourselves erect.

Ronald Reagan
Wall, Mind, Progress
United States. President (1981-1989 : Reagan), Ronald Reagan (1982). “Ronald Reagan”
There are no constraints on the human mind, no walls around the human spirit, no barriers to our progress except those we ourselves erect.