"To those who are planning to enter God's service as ministers, I would say, Strive with determination to be perfect in speech. Ask God to help you to accomplish this great object. When in the congregation you offer prayer, remember that you are addressing God, and that He desires you to speak so that all who are present can hear and can blend their supplications with yours. A prayer uttered so hurriedly that the words are jumbled together, is no honor to God and does the hearers no good. Let ministers and all who offer public prayer learn to pray in such a way that God will be glorified and the hearers will be blessed. Let them speak slowly and distinctly, and in tones loud enough to be heard by all, so that the people may unite in saying Amen.— Testimonies for the Church 6:380-383 . GW 89.2"
"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."
Both passages emphasize the importance of clear and understandable speech in public ministry. EGW stresses the need for ministers to speak clearly and distinctly in prayer, while 1 Corinthians 14:9 states that speech must be 'easy to be understood.' The connection is a direct principle, focusing on the need for clarity in communication.