Sentient beings are really Buddha.
Like water and ice;
Apart from water, no ice;
Outside of sentient beings, no Buddha.
Not knowing it is near
They seek for it afar!
Just like being in water,
But crying for thirst!

Hakuin Ekaku (1686 CE-1769 CE), Hakuin Ekaku was one of the most influential figures in Japanese Zen Buddhism and regarded as the reviver of the Rinzai school, refocusing it on its traditionally rigorous training methods integrating meditation and koan practice.