伴而不弃久而不腻
[bàn ér bù qì jiŭ ér bù nì]
'Ban Er Bu Qi Jiu Er Bu Ni,' translates roughly into 'Companion Yet Never Abandon; Long Term Yet Not Tedious'. It emphasizes on long-lasting relationships characterized by loyalty and constant support without becoming mundane. It indicates deep and sincere companionship that remains fresh even after a long time.