"“There are, it may be, so many kinds of voices in the world, and none of them is without signification. Therefore if I know not the meaning of the voice, I shall be unto him that speaketh a barbarian, and he that speaketh shall be a barbarian unto me. Even so ye, forasmuch as ye are zealous of spiritual gifts, seek that ye may excel to the edifying of the church.” 1 Corinthians 14:7-12 . CT 244.1"
"And even things without life giving sound, whether pipe or harp, except they give a distinction in the sounds, how shall it be known what is piped or harped? For if the trumpet give an uncertain sound, who shall prepare himself to the battle? So likewise ye, except ye utter by the tongue words easy to be understood, how shall it be known what is spoken? for ye shall speak into the air. There are, it may be, so many kinds of voices in the world, and none of them is without signification. Therefore if I know not the meaning of the voice, I shall be unto him that speaketh a barbarian, and he that speaketh shall be a barbarian unto me. Even so ye, forasmuch as ye are zealous of spiritual gifts, seek that ye may excel to the edifying of the church."
Ellen White directly references 1 Corinthians 14:7-12 in this passage.
"In all our religious services we should seek to conduct ourselves in a way that will edify others, working as much as lies in our power for the perfection of the church. “Wherefore let him that speaketh in an unknown tongue pray that he may interpret. For if I pray in an unknown tongue, my spirit prayeth, but my understanding is unfruitful. What is it then? I will pray with the spirit, and I will pray with the understanding also.... Else when thou shalt bless with the spirit, how shall he that occupieth the room of the unlearned say Amen at thy giving of thanks, seeing he understandeth not what thou sayest? For thou verily givest thanks well, but the other is not edified. CT 244.2"
"Wherefore let him that speaketh in an unknown tongue pray that he may interpret."
EGW directly quotes 1 Corinthians 14:13.
"For if I pray in an unknown tongue, my spirit prayeth, but my understanding is unfruitful."
EGW directly quotes 1 Corinthians 14:14.
"Else when thou shalt bless with the spirit, how shall he that occupieth the room of the unlearned say Amen at thy giving of thanks, seeing he understandeth not what thou sayest?"
EGW directly quotes 1 Corinthians 14:16.
"“I thank my God, I speak with tongues more than ye all: ye in the church I had rather speak five words with my understanding, that by my voice I might teach others also, than ten thousand words in an unknown tongue.” Verses 13-19 . CT 244.3"
"I thank my God, I speak with tongues more than ye all:"
EGW directly quotes 1 Corinthians 14:18.
"Yet in the church I had rather speak five words with my understanding, that by my voice I might teach others also, than ten thousand words in an unknown tongue."
EGW directly quotes 1 Corinthians 14:19.