Childhood memories
The foolish often remember more of their childhood than the wise. The wise do not linger on their childhood; they have no reason to harken back to happier days.
Difference
What a difference there is between the empty face of the passionless, and the bold face of the passionate. What a difference between glazed china eyes, and those that sparkle, a distant light, from a deep hidden source. What a difference between the weak, who have nothing to be ready for, and the strong, who are ever watchful.