Call upon Me in the day of trouble

Key passages
a. Because He will answer
Psalms 50:15
And call upon me in the day of trouble: I will deliver thee, and thou shalt glorify me.
Psalms 145:18-19
The LORD is nigh unto all them that call upon him, to all that call upon him in truth. He will fulfil the desire of them that fear him: he also will hear their cry, and will save them.
Psalms 34:6,17-19
This poor man cried, and the LORD heard him, and saved him out of all his troubles. The righteous cry, and the LORD heareth, and delivereth them out of all their troubles. The LORD is nigh unto them that are of a broken heart; and saveth such as be of a contrite spirit. Many are the afflictions of the righteous: but the LORD delivereth him out of them all.
Psalms 91:15
He shall call upon me, and I will answer him: I will be with him in trouble; I will deliver him, and honour him.
b. Trust Him
Psalms 62:8
Trust in him at all times; ye people, pour out your heart before him: God is a refuge for us. Selah.
Psalms 56:3
What time I am afraid, I will trust in thee.
c. Grace instead of immediate rescue
2 Corinthians 12:8-9
For this thing I besought the Lord thrice, that it might depart from me. And he said unto me, My grace is sufficient for thee: for my strength is made perfect in weakness. Most gladly therefore will I rather glory in my infirmities, that the power of Christ may rest upon me.
Luke 22:41-44
And he was withdrawn from them about a stone's cast, and kneeled down, and prayed, Saying, Father, if thou be willing, remove this cup from me: nevertheless not my will, but thine, be done. And there appeared an angel unto him from heaven, strengthening him. And being in an agony he prayed more earnestly: and his sweat was as it were great drops of blood falling down to the ground.
Hebrews 5:7-9
Who in the days of his flesh, when he had offered up prayers and supplications with strong crying and tears unto him that was able to save him from death, and was heard in that he feared; Though he were a Son, yet learned he obedience by the things which he suffered; And being made perfect, he became the author of eternal salvation unto all them that obey him;
Further study
General
Philippians 4:6
Be careful for nothing; but in every thing by prayer and supplication with thanksgiving let your requests be made known unto God.
Psalms 77:2
In the day of my trouble I sought the Lord: my sore ran in the night, and ceased not: my soul refused to be comforted.
James 5:13-18
Is any among you afflicted? let him pray. Is any merry? let him sing psalms. Is any sick among you? let him call for the elders of the church; and let them pray over him, anointing him with oil in the name of the Lord: And the prayer of faith shall save the sick, and the Lord shall raise him up; and if he have committed sins, they shall be forgiven him. Confess your faults one to another, and pray one for another, that ye may be healed. The effectual fervent prayer of a righteous man availeth much. Elias was a man subject to like passions as we are, and he prayed earnestly that it might not rain: and it rained not on the earth by the space of three years and six months. And he prayed again, and the heaven gave rain, and the earth brought forth her fruit.
Hebrews 4:14-16
Seeing then that we have a great high priest, that is passed into the heavens, Jesus the Son of God, let us hold fast our profession. For we have not an high priest which cannot be touched with the feeling of our infirmities; but was in all points tempted like as we are, yet without sin. Let us therefore come boldly unto the throne of grace, that we may obtain mercy, and find grace to help in time of need.
Psalms 88:1
O LORD God of my salvation, I have cried day and night before thee:
Psalms 102:1-2
A Prayer of the afflicted, when he is overwhelmed, and poureth out his complaint before the LORD. Hear my prayer, O LORD, and let my cry come unto thee. Hide not thy face from me in the day when I am in trouble; incline thine ear unto me: in the day when I call answer me speedily.
a. Because He will answer
Psalms 66:19
But verily God hath heard me; he hath attended to the voice of my prayer.
Matthew 7:7
Ask, and it shall be given you; seek, and ye shall find; knock, and it shall be opened unto you:
Psalms 18:6
In my distress I called upon the LORD, and cried unto my God: he heard my voice out of his temple, and my cry came before him, even into his ears.
Psalms 116:1-4
I love the LORD, because he hath heard my voice and my supplications. Because he hath inclined his ear unto me, therefore will I call upon him as long as I live. The sorrows of death compassed me, and the pains of hell gat hold upon me: I found trouble and sorrow. Then called I upon the name of the LORD; O LORD, I beseech thee, deliver my soul.