That virtue was sufficient of herself for happiness.

Related:

• That the gods superintend all the affairs of men, and that there are such beings as daemons.
  Diogenes Laertius (c. 200 AD) -- Plato,...
• Time is the image of eternity. -- Diogenes Laertius (c.
  200 AD) -- Plato,...
• Plato affirmed that the soul was immortal and clothed in many bodies successively.
  Diogenes Laertius (c. 200 AD) -- Plato,...
• Like sending owls to Athens, as the proverb goes. -
  Diogenes Laertius (c. 200 AD) -- Plato,...
• Plato was continually saying to Xenocrates, "Sacrifice to the Graces." -
  Diogenes Laertius (c. 200 AD) -- Xenocrates,...
• The chief good he has defined to be the exercise of virtue in a perfect life.
  Diogenes Laertius (c. 200 AD) -- Aristotle,...
• One ought to seek out virtue for its own sake, without being influenced by fear or hope,
  or by any external influence. Moreover, that in that...
• He used to define justice as "a virtue of the soul distributing that which each person deserved." -
  Diogenes Laertius (c. 200 AD) -- Aristotle,...
• Once he saw a youth blushing, and addressed him, "Courage,
  my boy! that is the complexion of virtue." -- Diogenes...