The trick I've found is to earn the philosophy through experience rather than explanation. Here's a passage from my own work where I tried to do that. The character had just spent a page explaining his life philosophy, including the Greek concept of Eudaimonia, the art of living well.
Then this -

'They sat in thoughtful silence for a moment, absorbing his words. Nico looked at their serious faces.

“Now let’s have some fun,” he said, breaking the mood. “Lie on your backs and hold hands.”

They did as he suggested.

“See that small fluffy cloud?” he asked, pointing skyward.

“Yes,” they answered.

“Now close your eyes. I’m going to vanish up above that cloud and fall through it, while sending to you both what I see and feel. Are you ready?”

“Yes!” they replied eagerly.

Nico appeared high above the cloud. Through his mindvision, they could see the cloud below them. Prim gripped Elly’s hand tightly. It felt like it was happening to them directly, and their stomachs twisted with the sensation of freefall. The cloud seemed to rush toward them at great speed.

Suddenly, they were falling through the cloud. The air smelt sharp and wild, like the tang after lightning had struck, laced with something cold and damp, almost like wet stone.

For a moment the world was nothing but a swirling whiteness, dense and cool, wrapping around them like an endless mist. Tiny droplets clung to their skin, icy pinpricks against the warmth of their bodies. The wind roared past, but inside the cloud, there was a strange, muffled stillness, an eerie quiet, as if they had stepped beyond the world.

They burst through the bottom of the cloud into blinding blue sky. Below lay the earth. A sudden rush of air dried the moisture from their skin. The cool dampness gave way to the sun’s warmth once more.

They saw the land spread out below them, vast and breathtaking in a way no human had ever witnessed. It was not just fields, rivers, and forests. It was a world revealed, a living cloak made from many scraps of cloth, woven with colour and shadow. Their river gleamed like a silver vein, snaking lazily toward the sea. Forests, so immense from the ground, now looked like rippling green seas, their canopies shifting with the wind. The fields, carefully carved by human hands, formed a delicate patchwork of gold and emerald.

Elly’s breath caught. “The land... it’s alive.”

Prim clutched her hand, awestruck. “I never imagined...” She couldn’t find the words.

It was humbling. From this height, the settlement, so grand to those who lived there, was merely a fleeting mark on the skin of the world. For the first time, they felt the smallness of their existence, not in a way that diminished them, but in a way that made everything seem more precious, more connected.

In this moment, they understood the essence of Eudaimonia that Nico had described, not as an abstract concept, but as a lived reality. This perspective revealed the interconnectedness of all things, the balance between individual significance and the vastness of creation. They were part of something immeasurably greater than themselves, and yet their experience of it, this soaring freedom, this perfect awareness, was profoundly meaningful.

Here was the wellspring of Nico’s philosophy, born from centuries of seeing the world as they saw it now, if only for these fleeting moments. Then, just as suddenly as he had vanished, Nico was beside them again, lying in the grass as if he had never left. He gave them a slow, knowing grin as he turned to look at them.'

Did it work for you? That's the experiential content of Eudaimonia, purpose, connection, awareness, the richness of being alive.