One-pointedness ☀️ bright
In As It Was Said (Itivuttaka)
The Buddha teaches that one could be far from him despite being physically close, and one could be near to him despite being physically far. When one sees the Dhamma, one sees the Buddha.
The Buddha describes the further training guideline on how to practice the Dhamma while walking, standing, sitting, and lying down for bhikkhus who are virtuous, and accomplished in the moral code of conduct.
In Middle Length Discourses (Majjhima Nikāya)
The Buddha explains to the brahmin Jāṇussoṇi how he overcame fright and dread while practicing seclusion in remote lodgings in the forests and woodlands, leading to the three true knowledges and full awakening.
The Buddha explains how even small attachments can be strong fetters if not relinquished, using similes of a quail and an elephant, and contrasts between the poor and wealthy. He describes four types of practitioners based on their response to attachment and mindfulness. The discourse also presents gradual refinement of meditative attainments from the first jhāna to the cessation of perception and feeling.
In Linked Discourses (Saṃyutta Nikāya)
An analysis of the four bases of psychic powers that are endowed with collectedness arising from aspiration, determination, purification of mind, and investigation.
In Numerical Discourses (Aṅguttara Nikāya)
The Buddha explains the three guiding authorities for developing wholesome qualities and maintaining purity - 1) Oneself, 2) world, and 3) Dhamma.
The Buddha uses the gradual purification of gold as a metaphor for mental cultivation through meditation. Just as a goldsmith removes coarse, medium, and subtle impurities until the gold is workable and radiant, a meditator abandons defilements in stages. This gradual refinement leads to deep collectedness of mind, forming the foundation for supernormal abilities and, ultimately, liberation.