Be sure to guard in your heart the joy of the Holy Spirit, and do not allow the evil one to pour out his bitterness. Beware! Beware, lest the Paradise that exists in you turns into Hell. Nectarios of Aegina
Put your trust in God; but be sure to keep your powder dry. Oliver Cromwell
Well, there's a remedy for all things but death, which will be sure to lay us flat one time or other. Miguel de Cervantes
If you turn into a dog, be sure to choose a rich family. Japanese Proverb
Be sure to have a controversial opinion, and men will talk about you. Arabic Proverb
Those who wade in unknown waters will be sure to be drowned. German Proverb