Keep love in your heart. A life without it is like a sunless garden when the flowers are dead.

Love is like a serious disease, which can effect not only one of your organs, but all of them, except the fact that if it happens is a blessing, not a misfortune. Life without it would be empty, miserable, and dead. The author compares it to a garden full of dead flowers, because of the lack of sunshine. Sunshine to flowers is like love to mankind.