And on what do you base this idea?Certainly there are additional truths circulating among the people that are written of in God's word, so discernment is an absolute requirement if one supposes to grow any and mature.
Scripture is closed there are no 'new' truths.
There are many who have stood up and proclaimed that they have a new 'truth' and if you investigate the mormons, JW, christadelphians, christianscience, scientologiset, islam etc you will learn that they don't have anything from God.
13 Howbeit when he, the Spirit of truth, is come, he will guide you into all truth: for he shall not speak of himself; but whatsoever he shall hear, that shall he speak: and he will shew you things to come. ../
If you really believe this verse you will acknowledge that what I have been saying is correct.
As Romans 12:1+2 teaches we are to be brainwashed by scripture into knowing it and Gods will for us.