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A promise from God is worth more than all the treasures of the world and can be relied upon more than money.
Ephesians 1:12  That we should be to the praise of his glory, who first trusted in Christ.
13  In whom ye also trusted, after that ye heard the word of truth, the gospel of your salvation: in whom also after that ye believed, ye were sealed with that holy Spirit of promise,
14  Which is the earnest of our inheritance until the redemption of the purchased possession, unto the praise of his glory.

Money is a promissary note backed by the resources of a country and can be used to buy earthly things.
Isaiah 40:6  The voice said, Cry. And he said, What shall I cry? All flesh is grass, and all the goodliness thereof is as the flower of the field:
7  The grass withereth, the flower fadeth: because the spirit of the LORD bloweth upon it: surely the people is grass.
8  The grass withereth, the flower fadeth: but the word of our God shall stand for ever.

A promise from God is backed by the resources of The Kingdom of Heaven and can be used to buy Heavenly things.
Isaiah 55:1  ¶Ho, every one that thirsteth, come ye to the waters, and he that hath no money; come ye, buy, and eat; yea, come, buy wine and milk without money and without price.
2  Wherefore do ye spend money for that which is not bread? and your labour for that which satisfieth not? hearken diligently unto me, and eat ye that which is good, and let your soul delight itself in fatness.
3  Incline your ear, and come unto me: hear, and your soul shall live; and I will make an everlasting covenant with you, even the sure mercies of David.

Earthly things are temporal and only last a little while.
Matthew 6:19  ¶Lay not up for yourselves treasures upon earth, where moth and rust doth corrupt, and where thieves break through and steal:

Heavenly things are everlasting and may be kept forever.
Matthew 6:20  But lay up for yourselves treasures in heaven, where neither moth nor rust doth corrupt, and where thieves do not break through nor steal:
21  For where your treasure is, there will your heart be also.

Labor not to acquire things of earth that are here today and gone tomorrow.
Proverbs 23:4  ¶Labour not to be rich: cease from thine own wisdom.
5  Wilt thou set thine eyes upon that which is not? for riches certainly make themselves wings; they fly away as an eagle toward heaven.

But rather labor to acquire things of Heaven that shall never pass away.
Labour not for the meat which perisheth, but for that meat which endureth unto everlasting life, which the Son of man shall give unto you: for him hath God the Father sealed. John 6:27

Where your treasure is, so shall your heart be also.
For where your treasure is, there will your heart be also. Luke 12:34

Let your heart be stayed on God.
Thou wilt keep him in perfect peace, whose mind is stayed on thee: because he trusteth in thee. Isaiah 26:3
Proverbs 4:20  ¶My son, attend to my words; incline thine ear unto my sayings.
21  Let them not depart from thine eyes; keep them in the midst of thine heart.
22  For they are life unto those that find them, and health to all their flesh.
23  Keep thy heart with all diligence; for out of it are the issues of life.