When writing an engagement card, its important to keep in mind the couples personalities and your relationship with them. Here are some tips and ideas from various sources:

Tips:

• Add a personal touch
• Dont be negative
• Share your fondest memories
• Include some genuine humor
• Congratulate the couple
• Express your excitement for their future together
• Wish them happiness and love

Ideas:

• "Congratulations on finding that one person you get to annoy for the rest of your life!"
• "Wishing you a lifetime of love and happiness together"
• "May your love story be as magical and beautiful as your engagement"
• "Im so excited to see what the future holds for you both"
• "Cheers to a lifetime of love and adventure!"
• "May your love continue to grow stronger with each passing day"

Remember, the most important thing is to write from the heart and let the couple know how much you care about them.