"The science of Yoga claims that it has discovered the laws which develop this personality, and by proper attention to those laws and methods, each one can grow and strengthen his personality. This is one of the great practical things, and this is the secret of all education. This has a universal application. In the life of the householder, in the life of the poor, the rich, the man of business, the spiritual man, in every one's life, it is a great thing, the strengthening of this personality."

- Swami Vivekananda, "The Powers of the Mind" (Jan 8, 1900, Los Angeles), Complete Works: Vol 2