I. Notice how beautifully there comes out here the occasion of trust. "What time I am afraid, I will trust in Thee." That goes deep down into the realities of life. It is when we are afraid that we trust in God, not in easy times, when things are going smoothly with us. This principle first fear and only then faith applies all round the circle of our necessities, weaknesses, sorrows, and sins.
II. Notice how there is involved in this the other consideration that a man's confidence is not the product of outward circumstances, but of his own fixed resolves. "I willput my trust in Thee."
III. These words, or rather one portion of them, give us a bright light and a beautiful thought as to the essence and inmost centre of this faith or trust. Scholars tell us that the word here translated "trust" has a graphic, pictorial meaning for its root idea. It signifies literally to cling to or hold fast anything, expressing thus both the notion of a good tight grip and of intimate union. That is faith, cleaving to Christ, turning round Him with all the tendrils of our heart, as the vine does round its pole, holding to Him by His hand, as a tottering man does by the strong hand that upholds.
IV. These two clauses give us very beautifully the victory of faith. "In God I have put my trust; I will not fear." He has confidence, and in the strength of that he resolves that he will not yield to fear. The one true antagonist and triumphant rival of all fear is faith, and faith alone. The true way to become brave is to lean on God. That, and that alone, delivers from otherwise reasonable fear. Faith bears in her one hand the gift of outward safety and in her other that of inward peace.
A. Maclaren, Weekday Evening Addresses,p. 103.