Look at in this respect, If you tell someone you will help him to do something or offer to perform some service, do you always fulfill your word.
To say yes, to something simply because you think it will please someone before first thinking out the consequences,can make you look a fool. By contrast, if you are careful about making promises, if you think matters through and consider how they will affect your future life, then it will be much easier to keep your word once you have committed yourself. You will have prepared your heart and mind to be true to your word.
Now Jesus, the greatest of all human teachers, based his teachings on the Scriptures. He spoke, not in his own name, but in the name of the One who sent him. (John 7:16-18) That is the example we follow. So, what we say either in the door-to-door ministry or at home Bible studies should centre on the authority of God’s Word. (2 Tim. 3:16, 17)
To no amount of clever reasoning on your part can possibly equal the effectiveness and power of the inspired Scriptures. The Bible has authority. Whatever point you are striving to help a student grasp, and time can be see here at –Mat 24:14.