2 Corinthians 6:17

The Christian, while in the world, is not to be of the world. He should be distinguished from it in the great object of his life. To him, "to live," should be "Christ." Whether he eats, or drinks, or whatever he does, he should do all to God's glory. You may lay up treasure; but lay it up in heaven, where neither moth nor rust doth corrupt, where thieves break not through nor steal. You may strive to be rich; but be it your ambition to be "rich in faith," and good works. You may have pleasure; but when you are merry, sing psalms and make melody in your hearts to the Lord. In your spirit, as well as in your aim, you should differ from the world. Waiting humbly before God, always conscious of his presence, delighting in communion with him, and seeking to know his will, you will prove that you are of heavenly race. And you should be separate from the world in your actions. If a thing be right, though you lose by it, it must be done; if it be wrong, though you would gain by it, you must scorn the sin for your Master's sake. You must have no fellowship with the unfruitful works of darkness, but rather reprove them. Walk worthy of your high calling and dignity. Remember, O Christian, that thou art a son of the King of kings. Therefore, keep thyself unspotted from the world. Soil not the fingers which are soon to sweep celestial strings; let not these eyes become the windows of lust which are soon to see the King in his beauty--let not those feet be defiled in miry places, which are soon to walk the golden streets--let not those hearts be filled with pride and bitterness which are ere long to be filled with heaven, and to overflow with ecstatic joy.

Then rise my soul! and soar away,

Above the thoughtless crowd;

Above the pleasures of the gay,

And splendours of the proud;

Up where eternal beauties bloom,

And pleasures all divine;

Where wealth, that never can consume,

And endless glories shine.

Charles H. Spurgeon

Psalms 5:8

Very bitter is the enmity of the world against the people of Christ. Men will forgive a thousand faults in others, but they will magnify the most trivial offence in the followers of Jesus. Instead of vainly regretting this, let us turn it to account, and since so many are watching for our halting, let this be a special motive for walking very carefully before God. If we live carelessly, the lynx-eyed world will soon see it, and with its hundred tongues, it will spread the story, exaggerated and emblazoned by the zeal of slander. They will shout triumphantly. "Aha! So would we have it! See how these Christians act! They are hypocrites to a man." Thus will much damage be done to the cause of Christ, and much insult offered to his name. The cross of Christ is in itself an offence to the world; let us take heed that we add no offence of our own. It is "to the Jews a stumblingblock": let us mind that we put no stumblingblocks where there are enough already. "To the Greeks it is foolishness": let us not add our folly to give point to the scorn with which the worldly-wise deride the gospel. How jealous should we be of ourselves! How rigid with our consciences! In the presence of adversaries who will misrepresent our best deeds, and impugn our motives where they cannot censure our actions, how circumspect should we be! Pilgrims travel as suspected persons through Vanity Fair. Not only are we under surveillance, but there are more spies than we know of. The espionage is everywhere, at home and abroad. If we fall into the enemies' hands we may sooner expect generosity from a wolf, or mercy from a fiend, than anything like patience with our infirmities from men who spice their infidelity towards God with scandals against his people. O Lord, lead us ever, lest our enemies trip us up!
Charles H. Spurgeon