Without Investigating
Ananuvicca Sutta  (AN 2:134)

“Endowed with two qualities, the fool—incompetent, a person of no integrity—keeps himself injured & impaired. He’s blameworthy, open to being blamed by the observant, & generates much demerit. Which two?

“Without investigating it, without examining it, he shows confidence in a matter that merits skepticism. Without investigating it, without examining it, he shows skepticism toward a matter that merits confidence.

“Endowed with these two qualities, the fool—incompetent, a person of no integrity—keeps himself injured & impaired. He’s blameworthy, open to being blamed by the observant, & generates much demerit.

“Endowed with two qualities, the wise person—competent, a person of integrity—keeps himself uninjured & unimpaired. He’s blameless, not open to being blamed by the observant, & generates much merit. Which two?

“Investigating it, examining it, he shows skepticism toward a matter that merits skepticism. Investigating it, examining it, he shows confidence in a matter that merits confidence.

“Endowed with these two qualities, the wise person—competent, a person of integrity—keeps himself uninjured & unimpaired. He’s blameless, not open to being blamed by the observant, & generates much merit.”

See also: MN 56; AN 3:66