A. Setting a condition for a specific confirming sign:

JDG 6:36. And Gideon said unto God, If thou wilt save Israel by mine hand, as thou hast said,

JDG 6:37. Behold, I will put a fleece of wool in the floor; and if the dew be on the fleece only, and it be dry upon all the earth beside, then shall I know that thou wilt save Israel by mine hand, as thou hast said.

JDG 6:38. And it was so: for he rose up early on the morrow, and thrust the fleece together, and wringed the dew out of the fleece, a bowl full of water.

JDG 6:39. And Gideon said unto God, Let not thine anger be hot against me, and I will speak but this once: let me prove, I pray thee, but this once with the fleece; let it now be dry only upon the fleece, and upon all the ground let there be dew.

JDG 6:40. And God did so that night: for it was dry upon the fleece only, and there was dew on all the ground.

GEN 24:14. And let it come to pass, that the damsel to whom I shall say, Let down thy pitcher, I pray thee, that I may drink; and she shall say, Drink, and I will give thy camels drink also: let the same be she that thou hast appointed for thy servant Isaac; and thereby shall I know that thou hast shewed kindness unto my master.

1SAM 14:8. Then said Jonathan, Behold, we will pass over unto these men, and we will discover ourselves unto them.

1SAM 14:9. If they say thus unto us, Tarry until we come to you; then we will stand still in our place, and will not go up unto them.

1SAM 14:10. But if they say thus, Come up unto us; then we will go up: for the LORD hath delivered them into our hand: and this shall be a sign unto us.

B. Fleeces can be inaccurate if options are too restricted:

ACT 1:23. And they appointed two, Joseph called Barsabas, who was surnamed Justus, and Matthias.

ACT 1:24. And they prayed, and said, Thou, Lord, which knowest the hearts of all men, shew whether of these two thou hast chosen,

ACT 1:25. That he may take part of this ministry and apostleship, from which Judas by transgression fell, that he might go to his own place.

ACT 1:26. And they gave forth their lots; and the lot fell upon Matthias; and he was numbered with the eleven apostles.

C. Requiring a sign often indicates unbelief:

JOH 4:48. Then said Jesus unto him, Except ye see signs and wonders, ye will not believe.

D. Confirming signs sometimes not given:

MAT 12:39. But he answered and said unto them, An evil and adulterous generation seeketh after a sign; and there shall no sign be given to it, but the sign of the prophet Jonas:

LUK 23:8. And when Herod saw Jesus, he was exceeding glad: for he was desirous to see him of a long season, because he had heard many things of him; and he hoped to have seen some miracle done by him.