Alternative form of you got a mouse in your pocket

Synonym of behind every successful man there stands a woman (“men's success often depends on the support and work of their wives or female partners”)

A man’s achievements are made possible by the support and work of their wife or female partner.

Alternative form of there are none so blind as those who will not see

The world, or some other specified environment, is a harsh and dangerous place.

Alternative form of there's no such thing as a stupid question

There is only one Earth, so humans must do everything they can to conserve Earth's environment now, i.e. by taking steps to mitigate climate change, etc.

Beneath that.

Synonym of hope springs eternal

Most thieves lack a sense of honor and are not to be trusted.