For our rejoicing is this, the testimony of our conscience, that in simplicity and godly sincerity; not with fleshly wisdom, but by the grace of God; we have had our conduct in the world, and more abundantly toward you. (II Corinthians 1:12)
But I fear lest by any means, as the serpent beguiled Eve in his craftiness, so your thoughts should be corrupted from the simplicity due to Christ. (II Corinthians 11:3)
You go your way, I'll go mine.
However there's a difference between simplemindedness and simplicity. Simplemindedness is easy to articulate. Simplicity is often too simple for words, and thus hard to articulate.
You go your way. I'll go His.