According to Osho, wisdom and understanding never arrive—they are your innate nature. Sudden or gradual are not qualities of enlightenment but reflections of your totality: with wholehearted intensity, coverings burn and realization is instantaneous; with half-heartedness, it appears stepwise. The timing is your responsibility and choice, available this very moment if you truly desire it, or postponed by ambivalence.
You already have wisdom; it shows up quickly when you want it completely, and seems slow when you don’t.