念佛  / niàn fó /
Chant the Buddha’s Name 
Description:
念佛不改心,等於說空話,心口若相應,立見佛菩薩。
Chanting the Buddha's name without changing one's mind is the same as empty words;
If mind and speech correspond, the buddhas and bodhisattvas can immediately be seen.
References:
星雲大師全集【書法類】中華文化佛教名詞 名相 The Complete Works of Venerable Master Hsing Yun: Calligraphy-Terminology 
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