सूक्ष्म रुप धरि सियहिं दिखावा। विकट रुप धरि लंक जरावा॥ Tulsidas has created this to encourage spiritual aspirants to become devotees of Lord Rama so that they're blessed and guarded by Hanuman, and are spiritually progressing. Via this mantra, a single praises Lord Hanuman being a dutiful messenger of Lord https://directory-b.com/listings13223869/the-2-minute-rule-for-hanuman-mantra