De Caussade is most well known for his book Abandonment to Divine Providence .
And for good reason - it is a spiritual classic.
Less well known is the counsel he gave in (published) letters to cloistered nuns in his care.
There is, I suppose, good reason for this, too - they constantly drive home, like nails through hands and feet, the need to abandon ourselves to Providence whatever the circumstances may be.
One could call them repetitive: 148 letters in seven books with minor va.