"If we died with him, we will also live with him; if we endure, we will also reign with him." (2 Timothy 2:11-12)
Timothy is to be strong in the grace that is in Christ Jesus and entrust what he has heard from Paul to reliable people who will also be qualified to teach others. The fourfold transmission is the structure of apostolic Tradition: Paul receives from Christ, gives to Timothy, Timothy entrusts to reliable people, who teach others. The Catechism identifies this chain as the living Tradition of the Church, the handing on of the apostolic deposit through the succession of faithful teachers in every generation (CCC 83). Timothy is to endure hardship like a good soldier of Christ Jesus. The soldier does not entangle himself in civilian affairs; the athlete does not win without competing according to the rules; the farmer who works hard gets a share in the crops.
A faithful saying: If we died with him, we will also live with him; if we endure, we will also reign with him. If we disown him, he too will disown us; if we are faithless, he remains faithful, for he cannot disown himself. The symmetry of the Paschal mystery governs the Christian life: death and life, endurance and reign, faithlessness met by faithfulness, because Christ cannot be other than who he is.
Do your best to present yourself to God as one approved, a worker who does not need to be ashamed and who correctly handles the word of truth. Avoid godless chatter because it leads to ungodliness. The Lord knows those who are his, and everyone who confesses the name of the Lord must turn away from wickedness. In a large house there are vessels of various kinds: some for special purposes and some for common use. Those who cleanse themselves from the latter will be instruments for special purposes, made holy, useful to the Master, and prepared for every good work.
Brothers and sisters, if we are faithless, he remains faithful, for he cannot disown himself. The faithfulness of God is not contingent on our faithfulness. It is the permanent character of who he is. This is the deepest comfort for the Christian who has been faithless: God's character does not change with our performance. He remains what he is. Return to him and find him exactly as you left him: faithful.
Lord Jesus, if we died with you we will live with you; if we endure we will reign with you. When we are faithless, you remain faithful, for you cannot disown yourself. Present us to God as approved workers, correctly handling the word of truth. Through Christ our Lord. Amen.