If there is a wave there must be a wind

Similar sayings:

No wind, no waves No wind, no waves
When the tree waves, wind is stirring When the tree waves, wind is stirring
Be in readiness for favorable winds Be in readiness for favorable winds
A crisis is an opportunity riding the dangerous wind A crisis is an opportunity riding the dangerous wind
A reed before the wind lives on, while mighty oaks do fall A reed before the wind lives on, while mighty oaks do fall

Chinese sayings and proverbs