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…but I am slow of speech and of a slow tongue.
Play to your strengths, says the world, and by “the world” we mean not only the secular world, but the church world as well. We try and make up for our lack of tools, not ones that we think we don’t have, but ones we think aren’t good enough to use. Instead of learning to use them more effectively and maximizing their use, we relegate them to the bottom of the toolbox, hoping no one will have to see them. We overcompensate and underestimate what God is trying to do with us as preacher, leader, layman, husband, wife, employee, and so on.
Lets put this in the context of the preacher first. It is like the preacher who may have the right message but delivers it with no passion at all, because he is “just not into that sort of thing”. Or like the preacher who can rev up the engine, but who spends no time in the study. Content and delivery, you can have both, it is much harder, but a preacher with no passion in his voice is patently ridiculous in this day and age. Yes, it makes a difference today, and it should. It might not have back then, but today it does, and yes, it really bothers and bores people to hear someone read the bible in a choppy, no inflection, monotone, metronome way.
The passion rises up out of the preacher when he is most passionate about God. When the preacher prizes God most, the passion about it comes out. The great preachers of today wouldn't hold my interest as much as they do if they had a passionless voice and staid delivery, no matter how good the words were. You can and you must have both content and delivery power.
Of course we must realize that God's Spirit can and will work through non-passionate, monotone preaching. Meaning, IF (not that a preacher should) a preacher/missionary was NOT a great non-monotone teacher, God's Spirit could work through his words regardless. The Spirit can and often does, but it is in spite of not because of their style, and vice versa, of course.
This is simply a matter of preference, mostly, but for many, they ought to give heed to their delivery. We often have this tool in the box but fail to sharpen it because, sinfully, we compare our gift to someone else's, and think it less, and so being prideful we don't share what we have. I may never have the exegetical prowess of John Calvin, but that doesn't mean I shouldn't do exegesis (God forbid!)...
Moses said his voice wasn’t good enough, but God asked him just who did he think made that mouth of his? You may not have the voice of a great singer, but God made your voice, so sing out loud the praises of His name. No matter what it sounds like to others, it sounds wonderful to Him, exactly as He designed it to be. You may not be able to do something as well as the next guy, but work at it, strive to be excellent for the glory of God and He will reward your diligence.
Using all the tools is being as God would have you to be, like Him. Think about it. God uses all the tools; some are more gifted speakers but God uses less gifted ones, some are more gifted in this or that area but God uses less gifted ones as well. How many times have you heard or seen someone with all their sophisticated argumentation, sincere pleading, and scriptural knowledge try and get someone to come to Christ, and then some supposed half wit talks to them once and they immediately fall to their knees in submission to Jesus?
God uses all the tools. So should you.