Theory looks well on paper, but does not amount to anything without practice.
A puppy plays with every pup he meets, but an old dog has few associates.
Experience makes more timid men than it does wise ones.
When a young man begins to go down hill everything seems to be greased for the occasion.
Shame is the dying embers of virtue.
To bring up a child in the way he should go, travel that way yourself once in a while.