'Thou mayest'

Adam knew Eve his wife; and she conceived, and bare Cain, and said, "I have gotten a man from the Lord." And she again bare his brother Abel. And Abel was a keeper of sheep, but Cain was a tiller of the ground. And in the process of time it came to pass that Cain brought of the fruit of the ground an offering unto the Lord. And Abel, he also brought of the firstlings of his flock and of the fat thereof. And the Lord had respect unto Abel and to his offering. But unto Cain and to his offering had no respect.
And Cain was very wroth, and his countenance fell. And the Lord said unto Cain, "Why art thou wroth? And why is thy countenance fallen? If thou doest well, shalt thou not be accepted? And if thou doest not well, sin lieth at the door. And unto thee shall be his desire, and thou shalt rule over him".
And Cain talked with Abel his brother: and it came to pass, when they were in the field, that Cain rose up against Abel his brother and slew him. And the Lord said unto Cain, "Where is Abel thy brother?" And he said, "I know not. Am I my brother's keeper?" And he said, "What hast thou done? The voice of thy brother's blood crieth unto me from the ground. And now art thou cursed from the earth, which hath opened her mouth to receive thy brother's blood from thy hand. When thou tillest the ground it shall not henceforth yield unto thee her strength; a fugitive and a vagabond shalt thou be in the earth." And Cain said unto the Lord, "My punishment is greater than I can bear. Behold, thou hast driven me out this day from the face of earth, and from thy face shall I be hid. And I shall be a fugitive and a vagabond in the earth; and it shall come to pass that everyone that findeth me shall slay me." And the Lord said unto him, "Therefore whosoever slayeth Cain, vengeance shall be taken on him sevenfold." And the Lord set a mark upon Cain, lest any finding him should kill him. And Cain went out from the presence of the Lord and dwelt in the land of Nod on the east of Eden.

[...]

"Don't you see?" he cried. "The American Standard translation ['Do thou'] orders men to triumph over sin, and you call sin ignorance. The King James translation makes a promise in 'Thou shalt', meaning that men will surely triumph over sin. But the Hebrew word, the word timshel - 'Thou mayest' - that gives a choice. It might be the most important word in the world. That says the way is open. That throws it right back on man. For if 'Thou mayest' - it is also true that 'Thou mayest not'. Dont you see?"
"Yes, I see. I do see. But you do not believe this is divine law. Why do you feel its importance?"
"Ah!" said Lee. "I've wanted to tell you this for a long time. I even anticipated your questions and I am well prepared. Any writing which has influenced the thinking and the lives of innumerable people is important. Now, there are many millions in their sects and churches who feel the order, 'Do thou', and throw their weight into obedience. And there are millions more who feel predestination in 'Thou shalt'. Nothing they may do can interfere with what will be. But 'Thou mayest'! Why, that makes a man great, that gives him stature with the gods, for in his weakness and his filth and his murder of his brother he has still the great choice. He can choose his course and fight it through and win." Lee's voice was a chant of triumph.
Adam said, "Do you believe that, Lee?"
"Yes, I do. Yes, I do. It is easy out of laziness, out of weakness, to throw oneself into the lap of deity, saying, 'I couldn't help it; the way was set.' But think of the glory of the choice! That makes a man a man. A cat has no choice, a bee must make honey. There's no godliness there. And do you know, those old gentlemen who were sliding gently down to death are too interested to die now?"
Adam said, "Do you mean these Chinese men believe the Old Testament?"
Lee said, "These old men believe a true story, and they know a true story when they hear ir. They are critics of truth. They know that these sixteen verses are a history of humankind in any age or culture or race. They do not believe a man writes fifteen and three-quarter verses of truth and tells a lie with one verb. Confucius tells men how they should live to have good and successful lives. But this - this is a ladder to climb to the stars." Lee's eyes shone. "You can never lose that. it cuts the feet from under weakness and cowardliness and laziness."
Adam said, "I don't see how you could cook and raise the boys and take care of me and still do all this".
"Neither do I," said Lee. "But I take my two pipes in the afternoon, no more and no less, like the elders. And I feel that I am a man. And I fell that a man is a very important thing - maybe more important than a star. This is not theology. I have no bent towards gods. But I have a new love for that glittering instrument, the human soul. It is a lovely and unique thing in the universe. It is always attacked and never destroyed - because 'Thou mayest'.

John Steinbeck - East of Eden