“He that speaketh in an unknown tongue edifieth himself; but he that prophesieth edifieth the church.”
King James Version (KJV)
14:4 Edifieth himself - Only, on the most favourable supposition. The church - The whole congregation.
1Co 14:4 He that speaketh in an [unknown] language edifieth himself. His speech in the unknown tongue tends to strengthen him, though not instructing others. He is made to feel that he is moved by God, and so is filled with awe.