A ship in port is safe, but that is not what ships are built for.
— Grace Murray Hopper

It is easy to give advice from a port of safety.
Friedrich von Schiller ports quote

If one does not know to which port one is sailing, no wind is favorable.
— Marcus Annaeus Seneca Seneca The Elder

Any port in a storm.
— Scottish Proverbs

To reach a port we must sail, sometimes with the wind, and sometimes against it. But we must not drift or lie at anchor.
— ports quotation by Oliver Wendell Holmes