Yes, we must lean 100% on the power of the Spirit in evangelism... but don't wing it...
http://www.youtube.com/watch?v=-kQeGXrlM-M
This is humbling, yes we need to not trust conventions and structures and especially not trust studies are human reasoning, we need to lean on the Spirit... but we still must, while being Spirit lead, study and seek God for the message that he wants to give. We should not frivolously talk but with carefulness that has sought God.
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The Bible Can't Be Boring:
http://www.youtube.com/watch?v=hU82-X2rprk
Meditate on truth my friends! Not because of duty, but from a motivation of love for Jesus-- doesn't the gospel just overwhelm you with joy? If not, run to him til it does.
"Unless we're very intentional about meditating on these truths [that show God's love], they slip from our thoughts like misty dreams that evaporate in the morning light. That's why Luther said we must "take heed then, to embrace...the love and kindness of God...[and to] daily exercise [our] faith therein, entertain no doubt of God's love and kindness." (Because He Loves Me, 36 )
"entertain no doubt of God's love and kindness" reminds me of
2 Timothy 2:16
New American Standard Bible (NASB)
"But avoid worldly and empty chatter, for it will lead to further ungodliness,"
Taking out time to meditate truth is good and a needed and to press falsehood from our midst. Give it no entertainment.