I said, “I will guard my ways,
Lest I sin with my tongue;
I will restrain my mouth with a muzzle,
While the wicked are before me.”
I was mute with silence,
I held my peace even from good;
And my sorrow was stirred up.
 My heart was hot within me;
While I was musing, the fire burned.
Then I spoke with my tongue:

 “Lord, make me to know my end,
And what is the measure of my days,
That I may know how frail I am.
 Indeed, You have made my days as handbreadths,
And my age is as nothing before You;
Certainly every man at his best state is but vapor.
Psalms 39:1-5