Passage
Now are we sure that thou knowest all things, and needest not that any man should ask thee: by this we believe that thou camest forth from God.
Now are we sure that thou knowest all things, and 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 go to the Father.
John 16:29 His disciples said unto him, Lo, now speakest thou plainly, and speakest no proverb.
John 16:30 Now are we sure that thou knowest all things, and 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 ye now believe?
John 16:32 Behold, the hour cometh, yea, is now come, that ye 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", "sure", "thou", "knowest", "needest", "should", "thee", and "believe". It is saying that the verse draws attention to "all things" and "sure", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 29's "His disciples said unto him Lo now..." into verse 31's "Jesus answered them Do ye now believe...", so "all things" and "sure" 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 "sure" with trust shaped by these words, not by a vague optimism outside the passage.