Psalm 37:5
Commit thy way unto the LORD; trust also in him; and he shall bring it to pass.

The word "trust" is the heart of faith and is the OT word given to the infant, or early stages of faith. The word "faith" conveys more an act of the will, while the word "belief" conveys an act of the mind or intellect, but trust is the language of the heart. The words "faith" and "belief" refer more to a truth believed or to something expected to happen.
Trust implies more than this, for it sees and feels and it leans on those who have a great, living, and genuine heart of love. Therefore let us "trust also in him" (Psalm 37:5), through all the delays, in spite of all the difficulties, and in the face of the rejection we encounter in life. And in spite of our feelings and evidence to the contrary, and even when we cannot understand out way or our situation, may we still "trust also in him; [for] he shall bring it to pass." The way will open, our situation will be changed, and the end result will be peace. The cloud will finally be lifted, and the light of eternal noonday will shine at last.

Trust and rest when all around you
Puts your faith to stringent test;
Let no fear or foe confound you,
Wait for God and trust and rest.
Trust and rest with heart abiding,
Like a birdling in its nest,
Underneath His feathers hiding,
Fold your wings and trust and rest.