Here's my advice to you: don't marry until you can tell yourself that you've done all you could, and until you've stopped loving the women you've chosen, until you see her clearly, otherwise you'll be cruelly and irremediably mistaken. Marry when you're old and good for nothing...Otherwise all that's good and lofty in you will be lost.
It is easier to give directions than advice, and more agreeable to have the right to act, even in a limited sphere, than the privilege to talk at large.
Louis Pasteur, the great scientist, said "chance favours the prepared mind", which is a posh way of saying 'do your homework', but it's an excellent piece of advice.