少年禁心菇凉静心
[shăo nián jìn xīn gū liáng jìng xīn]
Here, 'boy restrains his mind; girl calms hers' refers metaphorically to youths controlling impulsive emotions for tranquility and peace of mind, reflecting personal maturity, inner growth, or restraint over passions. (Note: '菇凉' usually means 'girl,' possibly an alternative way to spell '姑娘', and '禁心/静心' involves mental discipline or calmness.)