Trust in Scripture is almost never about achieving a particular emotional state. Abraham did not feel settled about sacrificing Isaac. The text does not say he felt at peace. It says he rose early and went. When Isaac asked where the sacrifice was, Abraham said "God will provide himself a lamb" (Genesis 22:8) — a statement that could be either faith or deflection, and the text does not tell us which. What we see is the action: the walking, the preparation, the hand reaching for the knife. The trust was enacted before the resolution came.
Proverbs 3:5–6 gives the most compact definition of trust in the Old Testament: "Trust in the LORD with all thine heart; and lean not unto thine own understanding: In all thy ways acknowledge him, and he shall direct thy paths." The instruction "lean not unto thine own understanding" does not mean turn off your brain. It means do not use your assessment of the situation as the final authority. The honest acknowledgment is that your understanding of any situation is partial, and God's is not. Trust is the posture of acting on incomplete information in the direction of the one whose information is complete.
The Psalms are full of people who are trying to trust God while not feeling the trust. Psalm 56:3 — "What time I am afraid, I will trust in thee" — names the sequence exactly. The fear comes first. The trust follows as a decision, not a resolution of the fear. Psalm 22 begins with abandonment and ends with worship. Psalm 73 begins with envy of the wicked and ends with "It is good for me to draw near to God." The movement in the Psalms is not from doubt to certainty. It is from honest confession of the present state to deliberate reorientation toward God.
Hebrews 11 is the biblical catalogue of faith. What is notable about its structure is that nearly every example includes the specific thing that was not yet visible when the trust was acted on. Abel — no record of what came next. Noah — no rain yet. Abraham — no child yet, no land yet, no ram in the thicket yet. The trust in every case was exercised in the absence of evidence, not because of it. That is the definition the chapter builds toward: "faith is the substance of things hoped for, the evidence of things not seen" (Hebrews 11:1).
Commentary is from a charismatic Protestant perspective, drawing on KJV text and public-domain sources including Spurgeon, Andrew Murray, and Matthew Henry.