From an old book that I love: “There are three necessary prayers and they have three words each. They are these, ‘Lord have mercy. Thee I adore. Into Thy hands.’ Not difficult to remember. If in times of distress you hold to these you will do well.” The Scent of Water–Elizabeth Goudge.

I read this passage several years ago and found the words to be wonderful. The simplicity of the prayers does not diminish the meaning of the heart-cries held in them of repentence, adoration, and trusting commitment to God. When one is going through an agony there is often a numbed mind and a loss for words. (I know this to be utterly true!) These, then, hold us in good stead.
Practice them, keep them ready; for in so doing, you will do well.