My point is, words are ALWAYS necessary.
And your words will have little to no effect if they are inconsistent with your actions. For example, you can preach to somebody constantly about the importance of honesty. You can pull every verse from the Old and New Testaments regarding lying and dishonesty.
And yet, if in your personal life, you lie, your words mean nothing. The manner in which you live your life directly impacts the weight and credibility you have as an evangelist. In fact, in spite of all the eloquent words, florid apologia and ability to quote chapter and verse, one who comes to be viewed as a hypocrite as the result of his actions will push people away from Christianity.
While the eternal Truths of the Gospel can not be undermined by the actions of men, the actions of men have a direct impact on whether or not others may accept or reject those Truths.
“Faith cometh by hearing...”