Passage
Now we know that thou knowest all things and thou needest not that any man should ask thee. By this we believe that thou camest forth from God.
Now we know that thou knowest all things and thou needest not that any man should ask thee. By this we believe that thou camest forth from God.
John 16:28 I came forth from the Father and am come into the world: again I leave the world and I go to the Father.
John 16:29 His disciples say to him: Behold, now thou speakest plainly and speakest no proverb.
John 16:30 Now we know that thou knowest all things and thou needest not that any man should ask thee. By this we believe that thou camest forth from God.
John 16:31 Jesus answered them: Do you now believe?
John 16:32 Behold, the hour cometh, and it is now come, that you shall be scattered every man to his own and shall leave me alone. And yet I am not alone, because the Father is with me.
The verse centers on "all things", "thou", "knowest", "needest", "should", "thee", and "believe". 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 Behold now..." into verse 31's "Jesus answered them Do you 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.