As is so often pointed out, we need more context. We need as much as possible of this song in order to figure out the meaning. Incidentally, it can be difficult to hear words accurately when they are sung, and I think the line you give should probably read "I looked down the line,...", as the verbs should agree in tense.There's a English song goes like " I look down the line, and I wondered."
I think is means that when I read the following line, I feel perplexed.
I am not sure if I am right. Can anyone help me?
I think it is a gospel song.
Thank you. But I think the song I am looking for is sung by Sister Tharpe.Line here means the railway line. It is looked in the song. He looked along the length of the railway line. Later he refers to dog by the railway track, the curve of the earth (horizon) and the sky.