Alara Kalama was one of the first ascetic teachers the Buddha came across in his journey.
As a wandering bhikku, a searcher after what is great, seeking the ultimate Peace, he came across Alara Kalama, a recognized monk, and stated his desire to live a holy life under his guidance. Alara Kalama agreed and let him stay in the abode. Alara Kalama said that his teachings are simple and a smartman can realize them by his own wisdom and contemplation and follow it likewise.
A while later, he had learnt his teachings, however they presented to him no acknowledgment of the most astounding Truth.
At that point there came to him the idea that the doctrine is not just based on faith. When Alara Kalama himself agrees that anybody can understand it with their own endeavours and follow it; undoubtedly, Alara Kalama lives having comprehended and seen this teaching.
So he went to him and asked “How far does this teaching of intuitive wisdom extend to?”. Alara Kalama told him about the Realm of Nothingness (Akincannayatana), a advance phase of Concentration.
He thought that while his teacher possessed confidence, power, focus, and knowledge, he too had those qualities. Likewise, he also understood the doctrine which his guru had arrived at.
Thus, he realised that while he understands the doctrine, it is not helping him realise his goal. He sought the higher Truth of life.
He then approached Alara Kalama and asked him if his doctrine was limited to this extent, he wanted to learn more.
Kalama was glad to hear how much Siddhartha had achieved. He honoured him by offering him to lead his company of ascetics.
Siddhartha Gautama was not content. He sought more than just mental concentration, he wanted to cease disgust, suffering, and achieve detachment and calmness. He was not anxious to lead the company too, yet he felt the need to perfect himself before he does something similar. He likened it to blind leading the blind and politely took his leave.