What does it mean to co-labour with Christ?

Title: What does it mean to co-labour with Christ?
Scripture (referenced): 1 Corinthians 3:6–9; John 15:1–5; 1 John 4:19
Scripture (inferred): Philippians 2:13; Colossians 1:29; Galatians 2:20; 2 Corinthians 3:5–6; Romans 11:36
Themes: co-labouring through abiding; God as the source of fruitfulness; receiving before giving; overflow of divine love; dependence on Christ; grace vs striving
Keywords: co-labour; fellow workers; abiding; vine and branches; overflow; Father’s love; fruitfulness; dependence; receiving; grace