Mark 13:35

So you must keep alert, for you do not know when the master of the house is coming -- in the evening or at midnight or at daybreak or early in the morning --

James 4:14

although you do not have the slightest knowledge of tomorrow. What is the nature of your life? It is really nothing but a mist which appears for a little while and then disappears.

Treasury of Scripture Knowledge

Summary

And he said, Behold now, I am old, I know not the day of my death:

I know not

General references

Bible References

I know not

Mark 13:35
So you must keep alert, for you do not know when the master of the house is coming -- in the evening or at midnight or at daybreak or early in the morning --
James 4:14
although you do not have the slightest knowledge of tomorrow. What is the nature of your life? It is really nothing but a mist which appears for a little while and then disappears.

General references

Romans 9:16
So one's destiny does not depend on his own willing or strenuous actions but on God's having mercy on him.