 Tsongkhapa presented his mature philosophy in a series of volumes during the later period of his life, beginning with the publication of his most famous work, the Great Exposition of the Stages of the Path (Lam rim chen mo) in 1402, at the age of 46. This was followed by Essence of Eloquence (Legs bshad snying po) and Ocean of Reasoning (Rigs pa'i rgya mtsho) (1407–1408), the Medium-Length Exposition of the Stages of the Path (Lam rim 'bring) in 1415, and, in the last years of his life, his Elucidation of the Intention (dGongs pa rab gsal).