From Latin 'credere' (to believe), which traces to the PIE compound *ḱred-dʰeh₁- meaning 'to place one's heart' — making credentials literally the documents that ask others to place their trust in you.
Documents or qualifications that attest to a person's authority, status, or right to credit and trust
Credentials derives from Medieval Latin 'credentiālis' (giving authority, pertaining to belief), from Latin 'credentia' (trust, belief), from 'credere' (to believe, to trust, to entrust). The PIE root is *ḱred-dʰeh₁-, a compound meaning 'to place one's heart,' from *ḱerd- (heart) and *dʰeh₁- (to put, place). This remarkable etymology reveals that 'to believe' originally meant 'to put one's heart into something' — a concept preserved across multiple Indo-European branches. The English word first appeared in the phrase 'letters credential' (15th century), meaning
The Latin 'credere' (to believe) literally meant 'to place one's heart' — from PIE *ḱerd- (heart) + *dʰeh₁- (to put). Sanskrit preserved the same compound as 'śrad-dhā' (faith, literally 'heart-placing'). So when you present your credentials, you're etymologically asking someone to place their heart in your trustworthiness.