What benefit do you receive from the holy conception and birth of Christ?

Heidelberg Catechism

Question 36. What benefit do you receive from the holy conception and birth of Christ?

Answer. That He is our Mediator,[1] and with His innocence and perfect holiness[2] covers, in the sight of God, my sin,[3] wherein I was conceived.[4]

[1] 1 Tim 2:5-6; Heb 2:16-17, 9:13-15;
[2] Rom 8:3-4; 2 Cor 5:21; Gal 4:4-5; 1 Pt 1:18-19;
[3] Ps 32:1; 1 Jn 1:9;
[4] Ps 51:5