Perception is an active process where the brain constructs meaning from sensory input.

"Sometimes, you have to be a little bit naughty to get what you want."

凡事天下要考察有无的原则，必定是以众人的耳目所见所闻的实情以知有与无来作为标准的。 

语言越精确，越能揭示其下的深渊。