Sometimes, no matter how hard you try to explain something, your audience just is not going to get it—especially if that audience is a sleepy house cat. Let's look at the key phrase for expressing that further effort is just a waste of time.
The Pointless Structure: ไปก็เท่านั้น
When you want to express a sense of rhetorical resignation—that doing something will not change the outcome—you can use the phrase ไปก็เท่านั้น. It translates to "doing [action] is pointless anyway" or "there is no use in [action]."
To use it, simply state your entire action or scenario first, followed immediately by ไปก็เท่านั้น. Let's see this applied to the absurd situation of discussing the ultimate truth (สัจธรรม) or speaking nonsensically (เพ้อเจ้อ) with a feline philosopher.
An Unreceptive Audience
A fluffy (ปุย) cat does not care about human philosophy. When faced with your profound ideas, it will likely just curl up (ขดตัว) and ignore you.
Recognizing Defeat
As you push your argument, the cat's behavior becomes even more dismissive. It might start licking (เลีย) its paw (อุ้งเท้า), or getting dreamy (เคลิบเคลิ้ม) and softly saying meow (เหมียว). These physical cues are your sign to give up, because continuing the debate is, once again, ไปก็เท่านั้น.
If you really want to win a debate with a cat, philosophical arguments will not work. You are going to need a more tangible bribe!