What does 2 Timothy 2:15 mean?

>Work hard so you can present yourself to God and receive his approval. What does that mean? >Be a good worker. What does that mean? >one who does not need to be ashamed an who correctly explains the word of truth. What does that mean? This is one verse of scripture. I just broke it down into three pieces so i can get a better understanding [2 Timothy 2:15 (NLT)] [1] >Work hard so you can present yourself to God and receive his approval. Be a good worker, one who does not need to be ashamed an who correctly explains the word of truth. Would anybody mind helping me understand this verse? Thanks in advance.