Double-mindedness is cause for agony in any arena:
Who wants an employee who has never decided to kick it in 100% with the company?
Or someone on the athletic team who is half-hearted?
Having our affections divided between God and the world is like a guy standing on two chunks of ice that are floating in opposite directions. Disaster is imminent!

Here’s how Francois Fenelon addresses this business of double-mindedness:

“Woe unto those weak and timid souls who are divided between God and their love for the world!

“They want and they do not want.

“They are torn by passion and remorse at the same time.

“They fear the judgments of God and those of others.

“They have a horror of evil and a shame of good.

“They have the pains of virtue without tasting its sweet consolations.

“O how wretched they are! Ah, if they had a little courage to despise the empty talk, the cold mockings, and the rash criticism of others, what peace they would enjoy in the bosom of God.”

“There is only one way to love God: to take not a single step without Him, and to follow with a brave heart wherever He leads.”

James cautions us that a double-minded man

James 1:6-8
6 But let him ask in faith, nothing wavering. For he that wavereth is like a wave of the sea driven with the wind and tossed.
7 For let not that man think that he shall receive any thing of the Lord.
8 A double minded man is unstable in all his ways.

So, if you are struggling with a divided heart, you may want to pray this prayer:

Psalm 86:10-11
10 For thou art great, and doest wondrous things: thou art God alone.
11 Teach me thy way, O LORD; I will walk in thy truth: unite my heart to fear thy name.