A right heart is HONEST, UNDIVIDED and TRUE (Luke 8:15; 1 Chron. 12:33; Heb. 10:22). There is nothing about it of falsehood, hypocrisy, or image-acting. It is not double or divided. It really is what it professes to be, feels what it professes to feel, and believes what it professes to believe. Its faith may be feeble. Its obedience may be very imperfect. But one thing will always distinguish the right heart. Its religion will be real, genuine, thorough, and sincere.

source: www.jcryle.info

Scripture

Luke 8

15 But the ones that fell on the good ground are those who, having heard the word with a noble and good heart, keep it and bear fruit with patience. -nkjv

15 But that on the good ground are they, which in an honest and good heart, having heard the word, keep it, and bring forth fruit with patience. -kjv

15 But the seed in the good soil, these are the ones who have heard the word with a good and virtuous heart, and hold it firmly, and produce fruit with perseverance. -nasb

15 But the seed on good soil stands for those with a noble and good heart, who hear the word, retain it, and by persevering produce a crop. -niv

1 Chronicles 12

33 of Zebulun there were fifty thousand who went out to battle, expert in war with all weapons of war, stouthearted men who could keep ranks; -nkjv

33 Of Zebulun, such as went forth to battle, expert in war, with all instruments of war, fifty thousand, which could keep rank: they were not of double heart. -kjv

33 From Zebulun, there were fifty thousand who went out in the army, who could draw up in battle formation with all kinds of weapons of war and helped David with an undivided heart. -nasb

33 from Zebulun, experienced soldiers prepared for battle with every type of weapon, to help David with undivided loyalty—50,000; -niv

Hebrews 10

22 let us draw near with a true heart in full assurance of faith, having our hearts sprinkled from an evil conscience and our bodies washed with pure water. -nkjv

22 Let us draw near with a true heart in full assurance of faith, having our hearts sprinkled from an evil conscience, and our bodies washed with pure water. -kjv

22 let’s approach God with a sincere heart in full assurance of faith, having our hearts sprinkled clean from an evil conscience and our bodies washed with pure water. -nasb

22 let us draw near to God with a sincere heart and with the full assurance that faith brings, having our hearts sprinkled to cleanse us from a guilty conscience and having our bodies washed with pure water. -niv