Solomon wrote, “For as he thinketh in his heart, so is he” (Proverbs 23:7). If the heart of an individual is chained to the things of the world, then he is worldly.
Paul had a companion who loved the world more than God. “For Demas hath forsaken me, having loved this present world,…” (2 Timothy 4:10). His desires got the best of him. His heart was right for a while, but he evidently neglected to care for it.
In the song “Is Thy Heart Right with God?” writer E.A. Hoffman asks several pointed questions concerning the individual’s relationship with God. “Have thine affections been nailed to the cross?” Paul wrote, “If ye then be risen with Christ, seek those things which are above, where Christ sitteth on the right hand of God. Set your affection on things above, not on things on the earth. For ye are dead, and your life is hid with Christ in God. When Christ, who is our life, shall appear, then shall ye also appear with him in glory” (Colossians 3:1-4). The heart’s desire should be to serve and worship God, seeking to put him first in all that is done.
From one of John’s letters, the folly of loving the world is clearly seen: “Love not the world, neither the things that are in the world. If any man love the world, the love of the Father is not in him. For all that is in the world, the lust of the flesh, and the lust of the eyes, and the pride of life, is not of the Father, but is of the world. And the world passeth away, and the lust thereof: but he that doeth the will of God abideth forever” (1 John 2:15-17).
As Hoffman wrote, most “nail their affections” to the cross, recognizing that one must put God and others above “self.” This is foreign to the thoughts of many in our world today. The world view is to promote self over all else. This is not the way God wants man to be. God wants us to put him first in all things (Matthew 6:33). All should strive to have healthy hearts, both physically and spiritually. It will take work to do both of these things.
A person must learn to control sin, or sin will control them. Some try to ride the fence, but it simply cannot be done. It is a choice that has to be made: God or Satan? “No man can serve two masters, for either he will hate the one and love the other, or else he will hold to the one and despise the other” (Matthew 6:24).
Sin comes about when one fails to control lust. “But every man is tempted, when he is drawn away of his own lust and enticed. Then, when lust hath conceived, it bringeth forth sin. And sin, when it is finished, bringeth forth death” (James 1:14-15). Temptation comes each day, and it is important that one works to overcome it each time.  
God’s word tells escape always is there, but it must be looked for and then taken. “There hath no temptation taken you but such as is common to man. But God is faithful, who will not suffer you to be tempted above that ye are able, but will with the temptation also make a way to escape, that ye may be able to bear it” (1 Corinthians 10:13).
God wants us to be saved. He has given his Son that we might live eternally. If your heart is not right, make some changes. Obey God according to his terms, believing in Jesus as the Son of God, repenting of sins, confessing Jesus before men, being baptized for the remission of sin and living for Jesus every day.