Fasting is not an end in itself, nor just a means to an end. In itself, it enriches the spirit, but through it, it impacts your world by the power of God released in a new measure through you…
In Luke 4 we read that “Jesus, being full of the Holy Spirit, was led by the Spirit into the wilderness, and He ate nothing…”
It seems that Jesus was led into the wilderness by the Holy Spirit to fast. Then after His fasting and overcoming temptation, the Scripture records that
Jesus returned in the power of the Spirit… v14
Note: He went in “led by the Spirit”, and came out “in the power of the Spirit.”
What’s the difference between “being filled with the Spirit” and “being in the power of the Spirit?” I’m not 100% sure, but whatever it means, Jesus had this power after fasting and resisting satan’s temptation (including satan’s offer of “bread” to meet His hunger need). Afterwards, He went into the synagogue “as His custom was” (i.e. He did what He had always done – everything seemed the same as before), but that day everything would change! Having read from the book of Isaiah, He declares that “today this word is fulfilled” and that “the Spirit of the Sovereign Lord is upon Me.” From here Jesus goes on in this power to “preach the gospel (Good News) of the Kingdom of God.” The power was manifest!