Some key texts or writings on Neo-Vedanta include Swami Vivekananda's "Raja Yoga," "Karma Yoga," "Jnana Yoga," and "Bhakti Yoga." These books are based on the teachings of the Upanishads and the Bhagavad Gita, but presented in a modern and accessible way for the Western audience.

In "Raja Yoga," Swami Vivekananda explains the eight limbs of yoga, including meditation, concentration, and self-discipline, as a means to achieve union with the divine. This text emphasizes the practical application of yoga in daily life, rather than just a theoretical concept.

"Karma Yoga" delves into the concept of selfless action and how it can lead to spiritual growth and liberation. Swami Vivekananda stresses the importance of performing one's duties without attachment to the outcome, as a way to transcend the ego and connect with the higher self.

"Jnana Yoga" focuses on the path of knowledge and self-inquiry, as a means to realize the ultimate truth of one's own existence. Swami Vivekananda explains the concept of maya (illusion) and the need to go beyond the limitations of the mind to experience the true nature of reality.

In "Bhakti Yoga," Swami Vivekananda explores the path of devotion and love for the divine. He emphasizes the importance of developing a personal relationship with God and the power of love to purify the mind and lead to spiritual awakening.

Apart from these books, Swami Vivekananda's lectures and speeches, such as "The Complete Works of Swami Vivekananda," are also considered important writings on Neo-Vedanta. These texts not only provide a deeper understanding of the philosophy but also offer practical guidance for incorporating its principles into everyday life.

Overall, Swami Vivekananda's writings on Neo-Vedanta present a modern interpretation of ancient Hindu philosophy, making it relevant and accessible to a global audience. His emphasis on practical application and universal principles of love, selflessness, and knowledge continue to inspire people around the world to this day.