Justin Martyr AD 150
Plain singing is not childish, but only the singing with lifeless organs, with dancing and cymbals,etc. Whence the use of such instruments and other things for children are lain aside, and plain singing only retained.
Clemens of Alexandria AD 190.
We Cristian's make use only of one organ or instrument, even the peaceful Word, with which we honour God; no longer with the old psaltery, trumpet, drum, cymbal, or pipe.
Cyprian AD 240.
Such organs, or instruments were then permitted in the OT church for this cause, even for the sake of their weakness, to stir up their minds to perform their external worship with some delight.
Chrysostom AD 396
Instrumental music was permitted to the Jews, as sacrifice was, for the heaviness and grossness of their souls. God condescended to their weakness, because they were lately drawn off idols; but now instead of instruments we may use our bodies to praise Him withal. Again, let no man deceive you, these instruments appertaining not to Christians; these are alien to the Catholics church; all these things do the nations of the world seek after.
The Magdeburg Centuriators on AD 666.
At last in the year 666, when the number of the beast (Rev 13) was now full, the churches received Latin singing with organs from Pope Vitalian, and from thence began to say Latin mass and to set up altars with idolatrous images.
Thomas Aqinas AD 1225-1274.
In the old law, God was praised both with musical instruments and human voices. But the church does not use musical instruments lest she should seem to Judaize. Nor ought a pipe ,or harp, or the like be brought into use in the Christian Church, but only those things that make the hearer better men. Under the OT such instruments were used because they were typical of something.
Erasmus AD 1516.
We have brought a cumbersome and theatrical music into our churches. Men run to church as to a theatre to have their ears tickled. And for this end organ makers are hired with great salaries.
Cardinal Cajetan Ad 1518.
The Church did not use organs in Thomas Aquinas' time, and even to this day the Church of Rome does not use them in the presence of the Pope.
Calvin 1546.
Instrumental music is not fitter to be adopted into the the public worship of the Christian Church than the incense, the candlestick,and the shadows of the Mosaic law.
John Wesley 1703-1791.
I have no objection to instruments being in our chapels, provided they are neither seen or heard.
Spurgeon.
We should like to see all all the pipes and organs in our Nonconformist places of worship either ripped open or compactly filled with concrete. The human voice is so transcendently superior.
I have omitted other historical and more modern quotes else I should be guilty of tedium. There is only one organ that had been created to express adoration and worship and that is the "little member." Sanctified and fitted to sound forth our great Redeemers praise both in time and eternity.
Instruments have no place in NT or in eternity.