'Understand' in the Bible

Therefore know and understand today, and take it to your heart, that the Lord is God in the heavens above and on the earth below; there is no other.

Therefore know [without any doubt] and understand that the Lord your God, He is God, the faithful God, who is keeping His covenant and His [steadfast] lovingkindness to a thousand generations with those who love Him and keep His commandments;

“The Lord will bring a nation against you from far away, from the end of the earth, [as swift] as the eagle swoops down [to attack], a nation whose language you will not understand,

Yet to this day the Lord has not given you a heart and mind to understand, nor eyes to see, nor ears to hear.