"Forewarned is forearmed" is an old adage, which implies that being prepared beforehand prevents any unexpected problems and mishaps. Other synonyms for this phrase could be "Knowledge is power," as it highlights the importance of being aware and informed about any upcoming challenges. "Prevention is better than cure" is also similar, as it emphasizes the need to take proactive measures to avoid any negative outcome. Another similar phrase is "Be proactive, not reactive," which encourages individuals to think ahead and plan accordingly. Ultimately, the moral of all these phrases is to stay prepared, alert, and vigilant in every situation.