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I have not ever heard that God speaks through the Sacraments.

http://www.the-highway.com/summary.html

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But since the Word is not perspicuous in many areas

The Word is perspicuous. Human minds are imperfect.

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WHO is authorized to give a proper interpretation of what has been said?

I believe, like other Protestants, in the hermeneutical principle known as the Analogy of Faith; that is, Scripture interprets Scripture. All true believers are priests, and as such all may read the Scripture and understand. However, we are not perfect yet, and so we will not read the Word infallibly. What authorizes the Magisterium, except a tradition which the Magisterium itself attempts to ground in Scripture?

Kyle

I tell you, this man went down to his house justified.