“Never underestimate yourself”
“Never underestimate your power to change yourself; never overestimate your power to change others.”
“Never underestimate what you can accomplish when you believe in yourself. Never give up.”
“Never underestimate what you can accomplish when you believe in yourself. (Unknown)”
“It is as much of a mistake to underestimate yourself as to overestimate yourself.”
“Don't underestimate your worth by comparing yourself with others.”