Some of our brethren engaged in business have not kept the Sabbath according to the commandment. Some have been in partnership with unbelievers, and the influence of these Sabbathbreaking associates has had its effect upon them. Some have been so blinded that they could not discern the danger in such connections, but it is only the greater because unperceived. While one partner is professedly observing the Sabbath, the other, with the laborers employed, is carrying on the business of the firm. The Sabbathkeeper, though not outwardly engaged in labor, cannot keep his thoughts from business matters. While he may endeavor to keep the Sabbath, he does not keep it. The Lord looks upon him as a transgressor. 2TT 180.4
Even in business relations we cannot, without involving principle, connect ourselves with those who are not loyal to God. What the one party feels that conscience forbids, the other allows. And this not merely in regard to religious matters, but in business transactions. The one acts from selfish motives, regardless of God's law or the salvation of the soul; and if the other sincerely loves God and the truth, there must be either a sacrifice of principle or frequent and painful differences. 2TT 181.1
It will require a continual struggle to resist the worldly influence and example of his ungodly associate. He has great difficulties to meet; for he has placed himself on the enemy's ground. The only safe course is to give heed to the inspired injunction: “Be ye not unequally yoked together with unbelievers: for what fellowship hath righteousness with unrighteousness? and what communion hath light with darkness?” “Come out from among them, and be ye separate, saith the Lord, and touch not the unclean thing; and I will receive you.” 2 Corinthians 6:14, 17. 2TT 181.2