"Since the earlier years of his profession of faith, Mark's Christian experience had deepened. As he had studied more closely the life and death of Christ he had obtained clearer views of the Saviour's mission, its toils and conflicts. Reading in the scars in Christ's hands and feet the marks of His service for humanity, and the length to which self-abnegation leads to save the lost and perishing, Mark had become willing to follow the Master in the path of self-sacrifice. Now, sharing the lot of Paul the prisoner, he understood better than ever before that it is infinite gain to win Christ, infinite loss to win the world and lose the soul for whose redemption the blood of Christ was shed. In the face of severe trial and adversity, Mark continued steadfast, a wise and beloved helper of the apostle. AA 455.1"
"Yea doubtless, and I count all things but loss for the excellency of the knowledge of Christ Jesus my Lord: for whom I have suffered the loss of all things, and do count them but dung, that I may win Christ,"
The EGW passage directly echoes the sentiment in Philippians 3:8, where Paul counts everything as loss for the sake of knowing Christ. Mark's experience, as described by EGW, mirrors this sentiment, highlighting the infinite value of Christ compared to worldly gain.