As old wood is best to burn; old horses to ride; old books to read; old wine to drink; so are old friends most trusty to use.

The quote argues by analogy: just as certain goods become more reliable or pleasurable as they age—seasoned wood burns better, a well-known horse rides more safely, time-tested books reward rereading, and mature wine tastes richer—so friendships deepen through duration and trial. “Most trusty to use” emphasizes trustworthiness and proven character over novelty or excitement. The list also implies that friendship is not merely sentimental; it is a practical resource, something one can depend on in need. The underlying moral is conservative in the best sense: value what has been tested by time, and prefer relationships grounded in shared history and demonstrated fidelity.