Genèse 2:18

"It is not good for man to be alone:" That they should not say that there are two powers: the Holy One, blessed be He, is unique in the upper beings and has no mate; and this one is unique in the lower beings and has no mate.

"A help opposite him (kenegdo):" If he merits [it], a help. If he does not merit [it], against him (an alternative meaning of kenegdo) to fight.

And the Lord God said, It is not right that Adam should be sleeping alone: I will make unto him a wife who may be a helper before him.

IT IS NOT GOOD THAT THE MAN SHOULD BE ALONE. It does not appear likely that man was created to be alone in the world and not beget children since all created beings — male and female of all flesh — were created to raise seed. The herb and trees also have their seed in them. But it is possible to say that it was in accordance with the opinion of the Rabbi who says: “Adam was created with two faces [i.e., male and female persons combined],” and they were so made that there should be in them an impulse causing the organs of generation to produce a generative force from male to female, or you may say “seed,” in accordance with the known controversy concerning pregnancy, Thazria concerning the opinion of the doctors and the Greek philosophers. and the second face was a help to the first in the procreative process. And the Holy One, blessed be He, saw that it is good that “the help” stand facing him, and that he should see and be separated from it or joined to it at his will. This is the meaning of what He said in the verse, I will make him a helper opposite him.
The meaning of the expression, it is not good, is that it cannot be said of man that “it is good” when he is alone for he will not be able to so exist. In the work of creation, “the good” means existence, as I have explained on the text, And G-d saw that it was good.

לא טוב היות האדם לבדו, the purpose of the human species on earth will not be achieved while man who is supposed to reflect the divine image will be left to personally carry out all the menial tasks of daily life on earth by being solitary.

עזר כנגדו, a helpmate who will be equal to him, also reflecting the divine image. This is essential for him if he is to know what precisely his needs are and so that he can meet them in time. The reason why the Torah added the word כנגדו is that whenever one confronts someone of equal power, moral and ethical weight, such a confrontation is termed נגד. It is a head-on collision of will. When the two parties disagreeing are not of equal power, or moral/ethical weight, the confrontation is termed as one being עולה or יורד one of the adversaries either prevailing or losing in such an encounter. It is in this sense that we have to understand such statements as משה שקול כנגד כל ישראל, “that Moses was the equal of the entire Jewish people.” (Mechilta Yitro 1) However, the Torah did not mean for woman to be 100% equal to man, else how could the man expect her to perform household chores for him, etc.? Hence the letter כ at the beginning of the word כנגדו somewhat tones down this equality.

ויאמר ה' אלוקים, G’d did not utter these words audibly, as is the meaning of the word when applied to human beings, but He “spoke” to Himself. Alternatively, G’d did utter words to that effect without directly addressing Adam, but Adam happened to hear these words. When the Torah speaks of “G’d speaking,” we must understand this as a sound created especially for that particular occasion. Seeing that Adam overheard the words אעשה לו עזר כנגדו, “I shall make for him a suitable companion,” he had entertained the hope that when all the animals paraded before him that he would encounter among them the helpmate, companion, G’d had spoken of. This is how we must understand the words in verse 20 ולאדם לא מצא עזר כנגדו, that he had not found a suitable helpmate when reviewing all the animals and naming them.
The Torah inserted these words between reporting on the commandment not to eat from the tree of knowledge and the sin, in order to make plain that man’s sin was due to the influence of the woman, as he had not eaten from this tree before she had been formed and been given to him as a mate, companion. Clearly, also when G’d gave Adam the commandments and forbade him to eat from that tree, seeing that the woman had not been created yet, she could not have heard this commandment from the mouth of G’d, but only from the mouth of her husband. The woman was clever enough to know that G’d had created both her husband and her. She presumed that communication from G’d took place by means of both her and her husband’s intellect, seeing that they were the only creatures who had been endowed with superior intellect.

לא טוב היות האדם לבדו, it is not good that he has no partner seeing that among the beasts he cannot find a partner, as none of them is on a par with him.

אעשה לו עזר, an assistant when the need should arise. Solomon, in Kohelet 4,9, paraphrased this when he wrote: טובים השנים מן האחד, “two are better than one alone.” Furthermore, woman was a necessity if man was to leave offspring behind to insure the continuity of his species.