Passage
Now we know that thou knowest all things, and hast not need that any one should demand of thee. By this we believe that thou art come from God.
Now we know that thou knowest all things, and hast not need that any one should demand of thee. By this we believe that thou art come from God.
John 16:28 I came out from the Father and have come into the world; again, I leave the world and go to the Father.
John 16:29 His disciples say to him, Lo, now thou speakest openly and utterest no allegory.
John 16:30 Now we know that thou knowest all things, and hast not need that any one should demand of thee. By this we believe that thou art come from God.
John 16:31 Jesus answered them, Do ye now believe?
John 16:32 Behold, [the] hour is coming, and has come, that ye shall be scattered, each to his own, and shall leave me alone; and [yet] I am not alone, for the Father is with me.
The verse centers on "all things", "thou", "knowest", "hast", "need", "should", "demand", and "thee". It is saying that the verse draws attention to "all things" and "thou", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 29's "His disciples say to him Lo now..." into verse 31's "Jesus answered them Do ye now believe...", so "all things" and "thou" belong inside that flow. In John context, the local focus is the identity of Jesus, new birth, eternal life, and belief and unbelief.
A plain takeaway is to answer the verse's own emphasis on "all things" and "thou" with trust shaped by these words, not by a vague optimism outside the passage.