Logassa (also called Logassa Sutra or Chaturvimshati Stavan) is a Jain stotra in Ardhamāgadhī Prakrit. Its simple meaning:

• It bows to and praises the 24 Tirthankaras (Arihants) who illuminate the whole universe and establish the path of dharma.
• It then venerates the perfected souls (Siddhas), describing their purity as beyond the moon and the sun and deeper than the ocean.
• By remembering these exalted beings, the devotee humbly seeks inner purity, right faith (samyaktva), good health, calm concentration (samādhi), and progress toward liberation.

Traditional note:

• Shvetāmbara tradition recites this Prakrit stotra in the daily Avashyakas (e.g., pratikraman, samayik).
• Digambara tradition recites an equivalent Chaturvimshati-stavan (wording varies, essence is the same: praise of the 24 Tirthankaras and reverence for the Siddhas).

For the full text with easy reference, see here: and a brief explanation here: