"The deep reverence and the strong affection felt for the Lord Gautama all over the East are due to two facts. One of these is that He was the first of our humanity to attain to the stupendous height of Buddhahood, and so He may be very truly described as the first-fruits and the leader of our race. (All previous Buddhas had belonged to other humanities, which had matured upon earlier chains.) The second fact is that for the sake of hastening the progress of humanity, He took upon Himself certain additional labours of the most stupendous character..."
January 1, 1970
https://en.wikiquote.org/wiki/Masters_of_Wisdom_(Theosophy)