A bad attitude is like a flat tire, you can't :

"A bad attitude is like a flat tire, you can't get very far until you change it."

A clever person solves a problem but :

"A clever person solves a problem. A wise person avoids it." 

- Albert Einstein

In life it's important to know when to stop :

"In life it's important to know when to stop arguing with people, smile and walk away."

- Unknown

Without rain. Nothing grows :

"Without rain. Nothing grows. Learn to embrace the storms of your life."

Depression :

"Over-thinking is one of the top causes of depression."

A girl's favorite song will tell you :

"A girl's favorite song will tell you more about her feelings than her lips ever will."

Strength and growth come only through :

"Strength and growth come only through continuous effort and struggle."

– Napoleon Hill