Isa 12:1 And in that day thou shalt say,
O LORD, I will praise thee: though thou wast angry with me,
thine anger is turned away, and thou comfortedst me.
2 Behold, God is my salvation;
I will trust, and not be afraid:
for the LORD JEHOVAH is my strength and my song;
he also is become my salvation.
3 Therefore with joy shall ye draw water out of the wells of salvation.
4 And in that day shall ye say,
Praise the LORD, call upon his name,
declare his doings among the people,
make mention that his name is exalted.
5 Sing unto the LORD; for he hath done excellent things:
this is known in all the earth.
6 Cry out and shout, thou inhabitant of Zion:
for great is the Holy One of Israel in the midst of thee.
There are many examples of trusting the Lord given to us in the Old Covenant.
We see Noah trusting for the ark to be finished before the rain, and trusting God to keep them during the great deluge.
Abraham trusting the God would fulfill his promises, even though it seemed that the answer was severely delayed and his body and that of his wife past the age of child bearing.
Isaac trusting for harvest even during famine.
Jacob trusting even though his life was threatened.
David, Jehosaphat, Hezekiah and many others throughout the threats against the kingdom of Israel.
In all these examples we see one constant, joy and praise and thanksgiving are all around. When I put my trust in God I can rejoice, for I know he will keep me, I can sing and cry and shout for he will deliver me. No matter the circumstance, no matter the "evidence" I know my God cares for me and has given me his protection. He is my strength, the joy of the Lord is my strength, and He is my song, the worship of my lips, and He will ultimately deliver; He is my salvation.