keep

Proverbs 22:5
Thorns and snares lie on the path of the perverse; he who guards his soul stays far from them.

Proverbs 23:19
Listen, my son, and be wise, and guide your heart on the right course.

Proverbs 28:26
He who trusts in himself is a fool, but one who walks in wisdom will be safe.

Deuteronomy 4:9
Only be on your guard and diligently watch yourselves, so that you do not forget the things your eyes have seen, and so that they do not slip from your heart as long as you live. Teach them to your children and grandchildren.

Psalm 139:23, 24
Search me, O God, and know my heart; test me and know my concerns. . . .

Jeremiah 17:9
The heart is deceitful above all things and beyond cure--who can understand it?

Mark 14:38
Watch and pray so that you will not enter into temptation. For the spirit is willing, but the body is weak."

Hebrews 12:15
Be careful that no one falls short of the grace of God, so that no root of bitterness will spring up to cause trouble and defile many.

with all diligence

Proverbs 4:7
Wisdom is supreme; therefore acquire wisdom. And whatever else you obtain, gain understanding.

Proverbs 3:21
My son, do not lose sight of this: Preserve sound judgment and discernment.

Proverbs 11:16
A gracious woman attains honor, but violent men gain only wealth.

Proverbs 13:3
He who guards his mouth protects his life, but the one who opens his lips invites his own ruin.

Ecclesiastes 5:13
There is a grievous evil I have seen under the sun: wealth hoarded to the harm of its owner,

for

Matthew 12:35
The good man brings good things out of his good store of treasure, and the evil man brings evil things out of his evil store of treasure.

Matthew 15:19
For out of the heart come evil thoughts, murder, adultery, sexual immorality, theft, false testimony, and slander.

Mark 7:21-23
For from within the hearts of men come evil thoughts, sexual immorality, theft, murder, adultery, . . .

James 1:14, 15
But each one is tempted when by his own evil desires he is lured away and enticed. . . .