In a nutshell, we see Jesus using the same principle that Isaiah went through when calling his disciples. Once chosen by God, Isaiah could not even disqualify himself but God had a solution to purify him and then He was assigned and sent serve as a prophet. The encounter He had in the throne provided him with a foundation that his purpose and calling was built on.
In the same way, every moment of our encounter with Jesus unveils a new season or a shift in our spiritual walk with Jesus. This is how our purpose gains ground in Him. When the Lord reveals Himself to us, then we find our identity in Him. This how we are also protected from falling off the track and through His sufficient Grace He ensures that we live to fulfill our destined purpose in Him.