In the first eleven verses of this chapter we find the well-known account of the wedding at Cana, where Jesus famously turns water into wine. Verse 11 records, "This beginning of His signs Jesus did in Cana of Galilee, and manifested His glory, and His disciples believed in Him."
Very helpfully, the footnote against 'signs' in my bible reads, "Or, attesting miracles, i.e. one which points to the supernatural power of God in redeeming grace." This is not then simply a show of power in doing something spectacular. This miracle shows God's power in helping out at the point of calamity, when all else has failed. The God-man, Jesus, steps in, as so often He does, and instead of just fixing the problem, He brings a solution that results in great commendation (not shame) for the bridegroom, the one at risk of disaster here. He redeems the bridegroom's serious egg-on-face potential into a headwaiter's compliment that no-one expected. That's what Jesus stepping-in can do! This is indeed miracle territory! The outcome is better than any man could have achieved. Just to have some wine would have done the job, but God goes beyond all we could ask or imagine!
So, allow the grace of God through miracle-working power to impact your life and discover how God is able to turn around completely any situation. Notice the effect of each miracle is the manifestation of glory (to God) and the outworking of believing in Him, the Lord Jesus Christ.
The other minor detail that I admire in this account is the bracketed words in verse 9, which says, "(but the servants who had drawn the water knew)."
It describes the privileged position of the obedient servants! Mary's advice was heeded and their obedience pays dividends... it always does.
In closing, let's be those who seek His Word and His voice, such that, "Whatever He says to you, do it."