Romans 15:3

Pleased not himself. Paul illustrates and enforces the duty of sacrificing our own pleasure for the good of our brethren by referring to the one supreme example of self-sacrificing love. Christ was willing to give up even His heavenly glory for the sake of fallen man, and He expects corresponding self-denial and sacrifice on the part of those whom He came to save and bless (see 5T 204). Surely His servants (ch. 14:4) should not deem themselves too exalted to condescend as their Master has done (see Phil. 2:5-8; 1 Peter 2:21).

As it is written. The quotation is from Ps. 69:9 (see comment there).