1 Chronicles 28:9 And thou, Solomon my son, know thou the God of thy father, and serve him with a perfect heart and with a willing mind: for the LORD searcheth all hearts, and understandeth all the imaginations of the thoughts: if thou seek him, he will be found of thee; but if thou forsake him, he will cast thee off for ever.

Job 28:23 God understandeth the way thereof, and he knoweth the place thereof.

Psalms 49:20 Man that is in honour, and understandeth not, is like the beasts that perish.

Proverbs 8:9 They are all plain to him that understandeth, and right to them that find knowledge.
14:6 A scorner seeketh wisdom, and findeth it not: but knowledge is easy unto him that understandeth.

Jeremiah 9:24 But let him that glorieth glory in this, that he understandeth and knoweth me, that I am the LORD which exercise lovingkindness, judgment, and righteousness, in the earth: for in these things I delight, saith the LORD.

Matthew 13:19 When any one heareth the word of the kingdom, and understandeth it not, then cometh the wicked one, and catcheth away that which was sown in his heart. This is he which received seed by the way side.
  23 But he that received seed into the good ground is he that heareth the word, and understandeth it; which also beareth fruit, and bringeth forth, some an hundredfold, some sixty, some thirty.

Romans 3:11 There is none that understandeth, there is none that seeketh after God.

1 Corinthians 14:2 For he that speaketh in an unknown tongue speaketh not unto men, but unto God: for no man understandeth him; howbeit in the spirit he speaketh mysteries.
  16 Else when thou shalt bless with the spirit, how shall he that occupieth the room of the unlearned say Amen at thy giving of thanks, seeing he understandeth not what thou sayest?