What do you believe concerning the “holy catholic Church?”

Heidelberg Catechism

Question 54. What do you believe concerning the “holy catholic Church?”

Answer. That out of the whole human race,[1] from the beginning to the end of the world,[2] the Son of God,[3] by His Spirit and Word,[4] gathers, defends, and preserves for Himself[5] unto everlasting life a chosen communion[6] in the unity of the true faith;[7] and that I am and forever shall remain a living member of this communion.[8]

[1] Gen 26:4; Rev 5:9;
[2] Isa 59:21; Jn 10:10; 1 Cor 11:26;
[3] Jn 10:11; Acts 20:28; Eph 1:10-13, 4:11-13; Col 1:18;
[4] Isa 59:21; Rom 1:16, 10:14-17; Eph 5:26;
[5] Ps 129:1-5; Mt 16:18; Jn 10:28-30;
[6] Rom 8:29-30; Eph 1:3-14, 4:3-6;
[7] Ps 71:18; Jn 10:28-30; Acts 2:42-47; 1 Cor 1:8-9, 11:26;
[8] Ps 23:6; Jn 10:27-28; 1 Cor 1:4-9; Gal 3:28; 1 Pt 1:3-5; 1 Jn 2:19, 3:14, 19-21