Passage
Jesus therefore said to the Jews who believed him, If ye abide in my word, ye are truly my disciples;
John 8:31 (DBY)
Nearby Context
John 8:29 And he that has sent me is with me; he has not left me alone, because I do always the things that are pleasing to him.
John 8:30 As he spoke these things many believed on him.
John 8:31 Jesus therefore said to the Jews who believed him, If ye abide in my word, ye are truly my disciples;
John 8:32 and ye shall know the truth, and the truth shall set you free.
John 8:33 They answered him, We are Abraham's seed, and have never been under bondage to any one; how sayest thou, Ye shall become free?
Study Lenses
The verse centers on "jesus", "therefore", "said", "jews", "believed", "abide", "word", and "truly". It is saying that the verse draws attention to "jesus" and "therefore", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 30's "As he spoke these things many believed..." into verse 32's "and ye shall know the truth and...", so "jesus" and "therefore" 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 "jesus" and "therefore" with trust shaped by these words, not by a vague optimism outside the passage.