Why do you not understand My speech? Because you are not able to listen to My word. (John 8:43)
The New Testament is the word of Christ Jesus. Jesus wants us to listen to His word so we can understand it. To do so we must have a desire to understand His word plus the willingness to do what He says. “If anyone wills to do His will, he shall know concerning the doctrine, whether it is from God or whether I speak on My own authority” (Jno. 7:17). Jesus spoke the very word of God. Are you able to listen to His word? If so, you will understand His teaching. Then you are ready to believe and obey Jesus.