I see two sides to it.

Love is enough. Yes.
Because at the end of the day, it's your love for the said person that will keep y'all together. You can't be with someone you don't love. To start with.

Love is not enough. Yes.
Because you'll have to do more than just 'having the feelings'.
You'll choose commitment. Choose peace. Choose that person everyday.
So you don't just say, "I love her". You'll have to do more than that.