Psalms 131
1O Lord, my heart is not lifted up, my eyes are not raised too high; I do not occupy myself with things too great and too marvelous for me.
2But I have calmed and quieted my soul, like a weaned child with its mother; my soul is like the weaned child that is with me.
3O Israel, hope in the Lord from this time on and forevermore.
Note: The answers above try to mostly come direct from the Bible (New Revised Standard Version - NRSV).