You have boldness to pray at God’s throne of grace due to the great mercies of Jesus.

“for we do not present our supplications before You because of our righteous deeds, but because of Your great mercies [rab racham].” (Dan 9:18)
“You have heard of the perseverance of Job and seen the end intended by the Lord—that the Lord is very compassionate and merciful.” (Jm 5:11)
“Let us therefore come boldly to the throne of grace, that we may obtain mercy and find grace to help in time of need.” (Heb 4:16)
“But God, who is rich in mercy, because of His great love with which He loved us” (Eph 2:4)
“However, for this reason I obtained mercy, that in me first Jesus Christ might show all longsuffering, as a pattern to those who are going to believe on Him for everlasting life.” (1Tim 1:16)
“Blessed be the God and Father of our Lord Jesus Christ, who according to His abundant mercy has begotten us again to a living hope through the resurrection of Jesus Christ from the dead” (1Pet 1:3)
“keep yourselves in the love of God, looking for the mercy of our Lord Jesus Christ unto eternal life.” (Jude 1:21)
“Blessed be the God and Father of our Lord Jesus Christ, the Father of mercies and God of all comfort” (2Cor 1:3)
“And the LORD passed before him and proclaimed, The LORD, the LORD God, merciful [rachum] and gracious [channan], longsuffering, and abounding in goodness [rab chesed] and truth, keeping mercy [chesed] for thousands, forgiving iniquity and transgression and sin” (Ex 34:6,7)
“And now, I pray, let the power [koach] of my Lord be great [gadal], just as You have spoken, saying, The LORD is longsuffering [arek] and abundant [rab] in mercy [chesed], forgiving [nasa] iniquity and transgression” (Num 14:17,18)
“But You are God, ready to pardon, gracious [channan] and merciful [rachum], slow to anger, abundant in kindness [rab chesed], and did not forsake them.” (Neh 9:17)
“Nevertheless in Your great mercy [rab racham] You did not utterly consume them nor forsake them; for You are God, gracious [channun] and merciful [rachum].” (Neh 9:31)
“But You, O Lord, are a God full of compassion [rachum], and gracious [channan], longsuffering and abundant in mercy [rab chesed] and truth.” (Ps 86:15)
“The LORD is gracious [channan] and full of compassion [rachum], slow to anger and great in mercy [gadol chesed]. The LORD is good to all, and His tender mercies [racham] are over all His works.” (Ps 145:8-9)
“The LORD is merciful [rachum] and gracious [channun], slow to anger, and abounding in mercy [chesed]” (Ps 103:8)
“Gracious [channun] is the LORD, and righteous [tsaddiyq]; yes, our God is merciful [racham].” (Ps 116:5)
“For He is gracious [channan] and merciful [rachum], slow to anger, and of great kindness [rab chesed]; and He relents from doing harm.” (Joel 2:13)
“for I know that You are a gracious [channan] and merciful [rachum] God, slow to anger and abundant in lovingkindness [rab chesed], One who relents from doing harm.” (Jon 4:2)
“But let him who glories glory [halal halal] in this, that he understands [sakal] and knows [yada] Me, that I am the LORD, exercising [asah] lovingkindness [chesed], judgment [mishpat], and righteousness [tsedaqah] in the earth. For in these I delight [chaphets], says the LORD.” (Jer 9:24)
“For I know the thoughts that I think toward you, says the LORD, thoughts of peace and not of evil, to give you a future and a hope.” (Jer 29:11)
Reading: Dan 9-11; 2Thes 1