'Simplicity' in the Bible

"{How long}, O simple ones, will you love simplicity? And [how long] will scoffers delight in their scoffing, and fools hate knowledge?

Lay aside simplicity and live; walk in the way of understanding."

And every day, devoting themselves [to meeting] with one purpose in the temple [courts] and breaking bread from house [to house], they were eating [their] food with joy and simplicity of heart,