พระอาจารย์อธิบายว่า วิตก คือการตรึก การยกกรรมฐานขึ้นมาตั้งไว้ในใจด้วยสติ ส่วนวิจาร คือการใคร่ครวญอยู่กับสิ่งนั้นซ้ำ ๆ ด้วยสัมปชัญญะไม่ให้เผลอ เมื่อวิตกวิจารทำงานต่อเนื่อง บุญจะถูกเหนี่ยวนำเข้ามาชำระล้างมลทินที่ปนอยู่ในจิตทีละอณู เจโตวิมุตติคือการหลุดพ้นจากนิวรณ์จนเข้าถึงฌาน ส่วนปัญญาวิมุตติคือการหลุดพ้นจากอวิชชาจนเข้าถึงวิชชา ทั้งสองจึงต้องอาศัยวิตกวิจารเป็นเครื่องมือชำระจิตอย่างต่อเนื่องPhra Ajarn explains that vitakka is directed thought — lifting a meditation anchor up and establishing it in the mind through mindfulness. Vicāra is repeated, unlapsing reflection on that same thing, which is clear comprehension. When vitakka and vicāra work continuously, merit is drawn in to cleanse the impurities mixed into the mind, particle by particle. Ceto-vimutti is liberation from the hindrances that opens access to the jhānas, while paññā-vimutti is liberation from ignorance that opens access to true knowledge — both depend on vitakka-vicāra as the continuous tool for purifying the mind.
Vitakka is directed thought — taking hold of something and lifting it up to establish it in the mind. It relies on () arising and directing itself toward that thing, setting it in the mind through this act of directed thought.
Vicāra is — reflecting on that same thing again and again, without lapsing. This unbroken continuity is what is meant by ().
Vitakka-vicāra, then, is directing thought and then reflecting on it, back and forth, staying with that one thing — staying with the we have taken up. When this continues, sustained by mindfulness and clear comprehension, is drawn in continuously.
How Vitakka-Vicāra Purifies
“Separating the elements” means drawing out every impure element that has mixed in, leaving only the pure element behind.
The process begins by taking something up through vitakka, and then descending into its details through vicāra — reflecting on it again and again, or relying on clear comprehension to go down into the details, knowing them fully and thoroughly.
Merit flows in through the midst of clear comprehension and cleanses away impurities in all these details, particle by particle, which makes the purification quick, because it breaks down into each individual detail, each fully known.
Every particle of the surrounding state carries some im. Merit spreads through it and cleanses it, bringing about purity and release — separating out the mixed-in elements so they burn off, while some settle as latent tendencies (anusaya). This is the process it depends on.
Ceto-vimutti and Paññā-vimutti
Ceto- is from impurities — that is, from (nivarana) — which opens access to , the second , and the jhānas in general, from the first through the fourth.
Paññā-vimutti opens access to clear in all its forms (vijjā), by relying on understanding that develops from learning (suya-paññā) into reflective wisdom (cintāmaya-paññā) and then into wisdom born of meditative development (bhāvanāmaya-paññā). The inner knower settles in, distilling and correcting, clearing away the element that covers and obscures — (abhijjhā) — and feeding in understanding that feels as though we thought of it ourselves. In this way, understanding becomes clear to us.
In Summary: Why They Depend on Vitakka-Vicāra
Whatever teaching we take up to learn, if we keep applying vitakka-vicāra to it again and again, merit is drawn in to cleanse away the impurity that covers and obscures. This allows versed in that subject to transmit understanding to us. This is how it works: both ceto-vimutti and paññā-vimutti depend on vitakka-vicāra for exactly this reason.