You therefore must endure hardship as a good soldier of Jesus Christ. No one engaged in warfare entangles himself with the affairs of this life, that he may please him who enlisted him as a soldier. (2 Tim 2:3-4)
“Soldier on” is an expression that depicts soldiers advancing in the pursuit of their mission objective despite hardship. The two words used in that simple expression say it all. A solider is one who is sent on a mission. He is to stay the course given to him, stay free from distractions, and do the job he is sent to do despite the hindrances and difficulties. If he was given a particular post to occupy he could not leave it. If he was given a specific assignment he needed to finish it. Simply put – he was to solider on with his duties.