'Understands' in the Bible

What was sown on the good ground, this is he who hears the word, and understands it, who most certainly bears fruit, and brings forth, some one hundred times as much, some sixty, and some thirty."

There is no one who understands. There is no one who seeks after God.

For he who speaks in another language speaks not to men, but to God; for no one understands; but in the Spirit he speaks mysteries.