אבות ב, א - איכה

(1) Rabbi Said: which is the straight path that a man should choose for himself? One which is an honor to the person adopting it, and [on account of which] honor [accrues] to him from others. And be careful with a light commandment as with a grave one, for you did know not the reward for the fulfillment of the commandments. Also, reckon the loss [that may be sustained through the fulfillment] of a commandment against the reward [accruing] thereby, and the gain [that may be obtained through the committing] of a transgression against the loss [entailed] thereby. Apply your mind to three things and you will not come into the clutches of sin: Know what there is above you: an eye that sees, an ear that hears, and all your deeds are written in a book.

(9) The LORD God called out to the man and said to him, “Where are you?” (10) He replied, “I heard the sound of You in the garden, and I was afraid because I was naked, so I hid.” (11) Then He asked, “Who told you that you were naked? Did you eat of the tree from which I had forbidden you to eat?”