Passage
And Peter began to say unto him: Behold, we have left all things and have followed thee.
And Peter began to say unto him: Behold, we have left all things and have followed thee.
Mark 10:26 Who wondered the more, saying among themselves: Who then can be saved?
Mark 10:27 And Jesus looking on them, saith with men it is impossible; but not with God. For all things are possible with God.
Mark 10:28 And Peter began to say unto him: Behold, we have left all things and have followed thee.
Mark 10:29 Jesus answering said: Amen I say to you, there is no man who hath left house or brethren or sisters or father or mother or children or lands, for my sake and for the gospel,
Mark 10:30 Who shall not receive an hundred times as much, now in this time: houses and brethren and sisters and mothers and children and lands, with persecutions: and in the world to come life everlasting.
The verse centers on "all things", "peter", "began", "behold", "left", "followed", and "thee". It is saying that the verse draws attention to "all things" and "peter", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 27's "And Jesus looking on them saith with..." into verse 29's "Jesus answering said Amen I say to...", so "all things" and "peter" belong inside that flow. In Mark context, the local focus is Christ, faith, and discipleship.
A plain takeaway is to answer the verse's own emphasis on "all things" and "peter" with trust shaped by these words, not by a vague optimism outside the passage.