A few proverbs you may like

As you sow so you reap. Sow a wind and reap the whirlwind. 

Once bitten twice shy.

A burnt child dreads fire.

He who asks a question is a fool for five minutes but the one who does not ask a question remains a fool for ever.

If a man deceives me once, shame on him.If a man deceives me twice shame on me.