My cowardly heart needs to learn to be silent

I'm often encouraged by the prayers of others. I'm inspired by that glimpse into the heart of another. Often I find bits of myself in others' prayers; and increased understanding. Here's part of just such a prayer by
Karl Rahner:

Though I find it so hard to serve you,
my weak and cowardly heart must learn to be silent and not to complain.
Rather should my mouth belie my heart - which wants to remonstrate with you - because in doing so it tells me of your truth, which is more important than mine:
Indeed, Lord, your service is good, your yoke is sweet and your burden light.

I thank you for all that you have asked of me in my life.
Be praised for the time in which I was born, glorified for my hours of happiness and my days of misery, blessed for everything that you have denied me.

Lord, though I am a lazy and head-strong servant, never dismiss me from your service.
You have power over my heart.
You have power over me even in the depths of my soul, where I alone am master of my eternal fate,
for your grace is the grace of eternal omnipotence.