I think verse 14 is different in so much its not a sign and wonder or a sign that causes wonderment. Just normal every day time keepers . In the new heaven and earth there will be no under the the Sun . Like the first three days . No night in the new.
A distinction between a sign of times and a sign and wonder must be made. Wonders have there own function .
Not sure why but Jesus said marvel not you must be born again ? I would think who would not marvel knowing one has eternal life.???
Perhaps believing can cause a person to move to do the will of another.. Signs for those who believe not prophecy. Prophecy for those who do believe the tongue of God as it is written
tongues = prophecy, Gods word, scripture.
In the law it is written, With men of other tongues and other lips will I speak unto this people; and yet for all that will they not hear me, saith the Lord.Wherefore tongues are for a sign, not to them that believe, but to them that believe not: but prophesying serveth not for them that believe not, but for them which believe.1 Corinthians 14:21-22