"Much time was occupied by the colporteurs who had been laboring in Catholic Europe, in relating their experiences and in telling the Council why our literature could not be sold in Europe on the plans that were very successfully followed in America; and it was urged by them that the colporteur must be given a salary, as was done by the leading evangelical societies that were operating in Catholic countries. LS 284.2"
"Even so hath the Lord ordained that they which preach the gospel should live of the gospel."
The EGW passage discusses paying colporteurs a salary, which directly relates to the principle in 1 Corinthians 9:14 that those who preach the gospel should be supported by it.