Well-known Christian author and speaker Joni Eareckson Tada is clinging to Scripture as she battles COVID-19.

Tada's advocacy organization, Joni and Friends, made the announcement on Saturday, asking people to pray for her.

"Friends, aren’t you so glad that we serve a sovereign God? Through each of our challenges, he is trustworthy, and his purposes are good," the post says.

After experiencing flu-like symptoms, she has tested positive for COVID-19 and is currently receiving monoclonal antibodies treatment.

Tada says, “It has been a long hard day, but I know people are praying because Ken’s and my spirits are bright.”

"While we know this diagnosis has not taken Jesus by surprise, we are interceding for Joni’s health, strength, and confidence in God’s good purposes," the organization says in the post. "We have seen God protect her from two bouts of cancer and we know he can do it again! Thank you for joining us in prayer!"

In an update on Monday, Tada says, "Psalm 84:11 assures me that ‘No good thing does he withhold from those who walk uprightly,’ and I am being showered with good courage, good endurance, a heart that sings good songs, and confidence in my good and great Savior."

"Although this is just the beginning of the road to recovery, her spirits are bright and with treatment, she is showing improvement!" the organization says.