There are certain challenges encountered when a person chooses to run a vision in the energy of the flesh;
1. Weariness and becoming burnt out becomes the staple of the flesh- Labouring in the flesh brings tiredness and weakness. Motivation fades out and grace is found wanting when a person relies heavily on His own ability to make things happen for His/Herself Gal.5:4.
Peter and his crew had fished all night but caught nothing Luke 5:5. He had used His expertise as a fisherman with his long standing knowledge( by experience) in fishery to decipher the proper timing of the ocean for a good catch. But all of his experience, knowledge and effort failed him (just like it does for many people today) so they caught nothing . Notice what Peter said to Jesus, at His offer of Grace to Peter. He said “We have Toiled all night and have taken nothing ”.
Peter had given up and thrown in the towel, but thank God for the words of Grace Jesus spoke to him that turned him around to obey Grace in the person of Jesus Christ.
When Jesus came along, giving them a simple instruction , it sounded stupid because they were already beat for the day, but as Jesus spoke, they dared to follow his instructions reluctantly after which was the great boom Luke 5:6-8. If Peter had insisted on his own effort, he would never have experienced the miracle of multiplication and abundance. Self effort wearies a person unto weakness and frustration but relying on Grace assures the fulfilment of every God given vision, gallantly with supernatural strength in grand style. Paul speaking in 1Cor.15:10 says I am what I am by the Grace of God. He went further to say though I laboured more abundantly than others; it was actually Grace which was with me doing the works. Without Grace you cant fulfil destiny and without Grace, you can’t meet up with the demands of destiny.