Step 1: Understanding the Concept:
This question asks to attribute a famous spiritual quote to its originator.
Step 2: Detailed Explanation:
The quote, "Sachahu orai sabh ko upari sachu acharu," translates to "Truth is higher than everything else, but higher still is truthful conduct/living."
This is a revered and fundamental teaching in Sikhism. It is a line from the sacred scripture, the Guru Granth Sahib, and is attributed to the first Sikh Guru, Guru Nanak Dev Ji. It emphasizes that simply knowing the truth is not enough; one must live truthfully.
The other options are incorrect:
2. Buddha: Emphasized the Four Noble Truths and the Eightfold Path.
3. Mahavira: Emphasized the principles of Ahimsa (non-violence) and Anekantavada (many-sidedness of reality).
4. Tulsidasa: A great poet and author of the Ramcharitmanas, whose teachings revolve around devotion to Lord Rama.
Step 3: Final Answer:
The quote is a core teaching of Guru Nanak and is found in Sikh scriptures. Therefore, option (1) is the correct answer.