What do you understand by pure? If you differentiate between pure and total, you'll have understood what he meant. When someone says for example pure unadulterated word of God it means word of God not interpreted with extraneous material, or a person's personal convictions. The litany of songs listed above are all of pure original Methodist songs. But I know where you are coming from. Your problem is the addition of two pure Catholic songs to the pure Methodist songs. But does that adulterate the purity of the Methodist songs that dominated songs. You're trying to enter into doctrinal issues with the Catholic which didn't begin with you and will never end with you. The Universal remains in spite of cessations. My advice to you is to end listening to the song when it reaches the Catholic portion. But that portion is my favourite. Happy Easter Sunday.