Romans 14:23: Whatever is not from Faith is sin. To me this means that there is a way to do things by faith and some other way of doing things.
Romans 10:17: If I know that I can acquire faith through hearing the words of Christ, then I should be reading!
Romans 9:31-32: Faith is not acquired by doing good works, but rather good works come as a result of faith.
John 15:3: I believe that (and you should check this for yourself [1 john 4:1]) the cleansing, Christ is referring to here is that which makes us righteous (Romans 4:5).
All this to say, that if I start doing something because it sounds good or it comes from a credible source, but I don't look to the God and his teaching; then I am not doing it by faith and I am in sin. I must be taught by God (1 Thessalonians 4:9 & John 14:26) and from his word in order to be subject to God (Romans 10:2-3).
One more encouragement: Hebrews 13:17 "Obey
I pray these words are sweet to your ears, and that the Lord gives you understanding and perception!