Obedience is "doing the next thing" with no assurance, no guarantee of it bringing visible or immediate results. This does not mean that obedience is not pregnant with purpose - it is. It just means that understanding does not often dawn until after that obedience is undertaken. It is usually after the step has been taken and the act fulfilled, that one sees from a different and much broadened vantage point.
I found out about P.T Forsyth when reading Art Katz. Forsyth was a Scotsman born in 1848. He wrote 25 books, one of which is "The Soul Of Prayer." What a book... worth a second and third and fourth reading.
"We are tempted to treat God as an asset, and to exploit Him. But true prayer, thinking most of the Giver, quells the egoism and dissolves it in praise. What we received came for another end than just to gratify us. It came to carry God to us, and to lift us to Him and to the concert of His glory. The blessing in it transcends the enjoyment of it, and the Spirit of the outgoing God returns to Him not void, but bringing our souls as sheaves with Him." p. 41
" We cannot be true Christians without being original.... For true originality we must be one, and closely one, with God. To be creative we must learn with the Creator." p. 90