“If there be any regrets in heaven — heaven is not supposed to have any regrets, we think of heaven as having all the regrets turned out and kept out, — and yet, if there could creep in regrets, I think there would be at least two, as we look back to the earth-life from the hills of God. One regret would be this: that we did not do more quiet praying, more claiming. I do not mean more simple repetition of religious language on our knees, but more insistent claiming, that the power of the Lord Jesus Christ shall apply here, and there, over the earth. That will be one regret, if there be regrets: that we did not ask enough, and did not ask big enough. We will say to ourselves, “What beggarly askers we were down on the earth!” The second regret, I think, if there be regrets, will be this: that we did not trust enough, that we did not trust God enough. We did not step out, when we could not see where to put the foot down, when He said, “Step out.” And if we might rule our lives here by what we shall think of them when we get yonder, then, I believe, we shall surely wear down the doorsills into our prayer-rooms.”” – S D Gordon
You can download for free an ebook version of his famous “Quiet Talks on Prayer” here.