Sarvadarshanasangraha 2.54

2.54

nanu kiṃvad iti pṛṣṭe dṛṣṭāntaḥ kathanīya iti cet

If you object: When it is asked, like what? you must quote an instance,—we reply: Not so, for momentary objects self-characterised being momentary, have no common characters, and therefore it is impossible to say that this is like that. We must therefore hold that all is like itself alone, like itself alone.