There’s no one technique that can guarantee that you’ll gain discernment, just as there’s no one technique that has a monopoly on giving rise to discernment. The techniques are things that you use in your quest for discernment, but your quest has to be informed by more than techniques. It has to be informed by the right questions, by the right qualities of mind, by the rigor you bring to your attention to what you’re doing, by your willingness to set the highest possible standards for yourself, your unwillingness to settle for a happiness that falls under the Three Characterisitics.
That’s how discernment comes about. Thanissaro Bhikkhu