The common idea that success spoils people by making them vain, egotistic and self-complacent is erroneous; on the contrary it makes them, for the most part, humble, tolerant and kind.
Summing Up (1938) p. 187

The common idea that success spoils people by making them vain, egotistic and self-complacent is erroneous; on the contrary it makes them, for the most part, humble, tolerant and kind.