Related:

• Most powerful is he who has himself in his own power. -- Seneca
• A person is a lion in his own cause.
• We are all bozos on the bus of life, lunatics every one, but there is a difference
  he one who can analyze his own delusion is often called a learned person, a philosopher....
• In an organization, each person rises to the level of his own incompetency -- The Peter Principle
• Peter Principle: In an organization, each person rises to the level of his own incompetency.
• The person who sings his own praise is probably a soloist.
• Let every fox take care of his own tail. Italian Proverb