One swallow does not make a summer. Success has many fathers, while failure is an orphan. When poverty comes in at the door, love flies out of the window. First impressions are the most lasting. Go abroad and you'll hear news of home.
Prevention is better than cure.
Hope for the best and prepare for the worst. Don't throw the baby out with the bathwater. Penny wise, pound foolish. Imitation is the sincerest form of flattery. Good fences make good neighbours.