"Be not thou afraid when one is made rich, when the glory of his house is increased; For when he dieth he shall carry nothing away: his glory shall not descend after him." -Psalm 49:16-17, KJV

We should not be fearful or even envious of those who are more prosperous than we are. We know that their riches are temporal and that we will have the only thing that matters in eternity--eternal life. This doesn't mean we can't work hard here (quite the opposite, really, since we are to be good stewards), but it does mean that we need to be sure our focus is on what will yield eternal fruit.

"For other foundation can no man lay than that is laid, which is Jesus Christ. Now if any man build upon this foundation gold, silver, precious stones, wood, hay, stubble; Every man's work shall be made manifest: for the day shall declare it, because it shall be revealed by fire; and the fire shall try every man's work of what sort it is. If any man's work abide which he hath built thereupon, he shall receive a reward. If any man's work shall be burned, he shall suffer loss: but he himself shall be saved; yet so as by fire. Know ye not that ye are the temple of God, and that the Spirit of God dwelleth in you? If any man defile the temple of God, him shall God destroy; for the temple of God is holy, which temple ye are. Let no man deceive himself. If any man among you seemeth to be wise in this world, let him become a fool, that he may be wise. For the wisdom of this world is foolishness with God. For it is written, He taketh the wise in their own craftiness. And again, The Lord knoweth the thoughts of the wise, that they are vain. Therefore let no man glory in men. For all things are yours; Whether Paul, or Apollos, or Cephas, or the world, or life, or death, or things present, or things to come; all are yours; And ye are Christ's; and Christ is God's." -1 Corinthians 3:11-23, KJV