How do you know it's from God

Solomon's wisdom in deciding which harlot would get the baby

Then two women who were harlots came to the king and stood before him. The one woman said, "Oh, my lord, this woman and I live in the same house; and I gave birth to a child while she was in the house. "It happened on the third day after I gave birth, that this woman also gave birth to a child, and we were together. There was no stranger with us in the house, only the two of us in the house."This woman's son died in the night, because she lay on it. "So she arose in the middle of the night and took my son from beside me while your maidservant slept, and laid him in her bosom, and laid her dead son in my bosom. "When I rose in the morning to nurse my son, behold, he was dead; but when I looked at him carefully in the morning, behold, he was not my son, whom I had borne." Then the other woman said, "No! For the living one is my son, and the dead one is your son." But the first woman said, "No! For the dead one is your son, and the living one is my son." Thus they spoke before the king.

Then the king said, "The one says, `This is my son who is living, and your son is the dead one'; and the other says, `No! For your son is the dead one, and my son is the living one.' " The king said, "Get me a sword." So they brought a sword before the king. The king said, "Divide the living child in two, and give half to the one and half to the other."Then the woman whose child was the living one spoke to the king, for she was deeply stirred over her son and said, "Oh, my lord, give her the living child, and by no means kill him." But the other said, "He shall be neither mine nor yours; divide him!" Then the king said, "Give the first woman the living child, and by no means kill him. She is his mother." When all Israel heard of the judgment which the king had handed down, they feared the king, for they saw that the wisdom of God was in him to administer justice. (1 Kings 3:1-28)

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King Solomon had to decide between the two women as to which was the mother of a baby.
How did he arrive to his answer? It was when the sword was brought before him.
How do we arrive to the answer we're uncertain about or a direction or decision we have to make. Did it come from my own fleshly thoughts, God or Satan? We ask ourselves sometimes...
Bring the sword into the picture. The Sword of the Spirit is the Word of God. (Eph 6:17)
For the word of God is living and active and sharper than any two-edged sword, and piercing as far as the division of soul and spirit, of both joints and marrow, and able to judge the thoughts and intentions of the heart. (Hebrews 4:12)
The Sword of the Spirit, the Word of God will cause you to walk in the wisdom of God in all your undertakings.