Launch not beyond your depth - Alexander Pope

Let such teach others who themselves excel

Some valuing those of their own side or mind,
Still make themselves the measure of mankind:
Fondly we think we honor merit then,
When we but praise ourselves in other men.

Presumptuous Man! the reason wouldst thou find,
Why form'd so weak, so little, and so blind?
First, if thou canst, the harder reason guess,
Why form'd no weaker, blinder, and no less!
Ask of thy mother earth, why oaks are made
Taller or stronger than the weeds they shade?
Or ask of yonder argent fields above,
Why Jove's Satellites are less than Jove?