Mark 4:24-25

Then He said to them, “Pay attention to what you hear. By your own standard of measurement [that is, to the extent that you study spiritual truth and apply godly wisdom] it will be measured to you [and you will be given even greater ability to respond]—and more will be given to you besides. For whoever has [a teachable heart], to him more [understanding] will be given; and whoever does not have [a yearning for truth], even what he has will be taken away from him.” [Matt 13:12; 25:29; Luke 8:18]