“With the measure you use, it will be measured to you”
Pay attention to what you hear. With the measure you use, it will be measured to you, and even more will be added to you. (Mark 4:24 BSB)
What it sounds like today
Poetic abundance language.
The cultural key
A grain-market scene, step by step: an honest seller fills the measure, presses the grain down, shakes the vessel so it settles into every gap, then keeps pouring until it overflows. 'Into your lap' is the kolpos, the fold of the outer robe pulled up over the belt to form a carrying pouch; it was the everyday pocket, and grain was literally poured into it. The same market image serves three different lessons across the Gospels: generosity in Luke, judgment of others in Matthew (7:2), and here in Mark, of all things, listening.
Recovered meaning
Bring a big measure to your hearing: attention is the container, and God fills it to the rim and past it ('still more will be added'). The stingy listener leaves the market with a stingy harvest.