Any Spanish-Speaking Google Adepts Here?

A Spanish priest in Russia writes me (by the way, isn’t the internet cool?):

I am a catholic Spanish priest who work in Russian. I found a Chesterton´s text that is on many websites under the spanish name: Por qué me convertí al catoliscimo. You can see for example:. . I try to find the English original, but can not find anywhere. Could you help me and tell me where I can find the original text?

Thank you very much.

If one of you knows, could you send me a link to send him, cur I can’t read Spanish.