A wonderful poem by Sri Aurobindo (from Collected Poems (Centenary Library, Vol. 5, p.143)), as recorded here, a marvellous exposition of the Yoga:

Surrender

O Thou of whom I am the instrument,
O secret Spirit and Nature housed in me,
Let all my mortal being now be blend
In Thy still glory of divinity.

I have given my mind to be dug Thy channel mind,
I have offered up my will to be Thy will:
Let nothing of myself be left behind
In our union mystic and unutterable.

My heart shall throb with the world-beats of Thy love,
My body become Thy engine for earth-use;
In my nerves and veins Thy rapture's streams shall move;
My thoughts shall be hounds of Light for Thy power to loose.

Keep only my soul to adore eternally
And meet Thee in each form and soul of Thee.