The Heavenly Secret Technique, as the name implies, could peek into the mysteries of heaven, deduce the myriad aspects of existence, communicate with ghosts and spirits, and overturn yin and yang. It was a divine skill that went against the heavens.
Even the once Xiao Chen didn't dare claim he fully comprehended the Heavenly Secret Technique, nor could he use it with ease.
Moreover, although he knew the technique, he hardly ever used it.
Firstly, peeking into the heavens' secrets easily invited divine punishment and entangled one with cause and effect, which was hard to shake off and hindered his own path.
Even though the path he aspired to was not bound by cause and effect, after all, he hadn't yet reached that realm and couldn't truly rid himself of cause and effect.
Secondly, he was someone who didn't believe in fate. The future held countless possibilities, and even if he made predictions, he wouldn't take them entirely seriously.