สัจจกิริยาคือการแสดงอาการแห่งสัจจะซึ่งเกิดขึ้นก่อนเสมอ ส่วนสัจจาธิษฐานคือการอาศัยสัจจะที่หลอมรวมกับอานุภาพนั้นแล้วตั้งความปรารถนาให้สิ่งที่ต้องการสำเร็จAn act of truth (sacca-kiriya) is the expression of truth itself, and it always arises first; a vow of truth (sacca-adhitthana) then draws on that merged power to set a wish and bring it to fulfillment.
Someone asked: what is the difference between sacca-kiriya, an act of truth, and sacca-adhitthana, a vow made on truth?
Sacca-kiriya is the kiriya — the outward expression, the manifestation of truth. It arises first.
Sacca-adhitthana relies on that truth and then puts it to use in making a resolution. Sacca-kiriya always arises before sacca-adhitthana.
Phra Ajarn explained the mechanism behind using truth this way: it is a connection with the One who knows, whose power spans countless, innumerable aeons — this is Nibbana. It is a merging into oneness with that power — this is sacca-kiriya.
Sacca-adhitthana, then, relies on that merging of power with him, and from there one sets the wish for whatever it is one wants to come true.