Arthur Pink on the Faithfulness of God

“‘Know therefore that the Lord thy God, He is God, the faithful God’ (Deut 7:9). This quality is essential to his being, without it he would not be God. For God to be unfaithful would be to act contrary to his nature, which were impossible: ‘If we believe not, yet he abideth faithful; he cannot deny himself’ (2 Tim 2:13). Faithfulness is one of the glorious perfections of his being. He is as it were clothed with it: ‘O Lord God of hosts, who is a strong Lord like unto thee? Or to thy faithfulness round about thee?” (Ps 89:8). So too when God became incarnate it was said, ‘righteousness shall be the girdle of his loins, and faithfulness the girdle of his reins’ (Isa 11:5)

“What a word is that in Ps 36:5, ‘Thy mercy, O Lord, is in the heavens; and thy faithfulness unto the clouds.’ Far above all finite comprehension is the unchanging faithfulness of God. Everything about God is great, vast, incomparable. He never forgets, never fails, never falters, never forfeits his word. To every declaration of promise or prophecy the Lord has exactly adhered, every engagement of covenant or threatening he will make good, for ‘God is not a man, that he should lie; neither the son of man, that he should repent; hath he said, and shall he not do it? Or hath he spoken, and shall he not make it good?” (Num 23:19). Therefore does the believer exclaim, ‘His compassions fail not, they are new every morning; great is they faithfulness’ (Lam 3:22-23).”

From The Attributes of God (Baker Books, 1975): 66-67.