Every human or living being has dual personalityThis world consists with living beings as well human with pros and cons. It is said as having two sides to a coin we can see dual personality in everything and anything.
In one moral story, a dove was mocked by a tortoise for its construction of nest in bad shape.Dove though explained the tortoise did not stop its comments and mocking as it has a strong and fine shell as its house. Finally dove told the tortoise that the house of tortoise though looks fine and strong,is not useful for others except self but his (dove)nest though looks in bad shape, useful for his whole family.
In spiritual, Bhagavat Geetha the other side of tortoise is referred. While explaining 'sthithapragnan' Lord Krishna told Arjuna,'like a tortoise one should withdraw one's senses from sense objects as tortoise withdraws at once at the slightest hint of danger'.
So everything tells us (teaches us) we should see the good side of everything and ignore the unlikely side.