I read that Baba told Kakasaheb Dixit to 'nail down' Vitthal after he had a vision. What is the spiritual meaning behind this strange phrase?

The instruction to "nail down" Vitthal, as found in Chapter 4, is a profound spiritual metaphor. After Kakasaheb Dixit had a meditative vision of Vitthal, Baba asked him, "Vitthal Patil had come, right? ... That Vitthal is a big runaway! Nail him down and make him steady. He will escape if you avert your eyes, even for a moment of neglect." Baba was not speaking literally. He was advising Kakasaheb that divine visions and spiritual states can be fleeting, like a "runaway." The act of "nailing him down" symbolizes the practice of making that divine consciousness a permanent fixture in one's heart through constant remembrance, unwavering devotion, and focused practice, so that the experience is not lost to worldly distractions or spiritual neglect.