All cruelty springs from weakness.

Lucius Seneca
Profession: Philosopher
Nationality: Roman

Some suggestions for you :
The first step towards amendment is the recognition of error.
Whatever one of us blames in another, each one will find in his own heart.
We become wiser by adversity; prosperity destroys our appreciation of the right.
That is never too often repeated, which is never sufficiently learned.
If one does not know to which port one is sailing, no wind is favorable.
True happiness is…to enjoy the present, without anxious dependence upon the future.
It is more fitting for a man to laugh at life than to lament over it.