If you can't be content with what you have received, be thankful for what you have escaped.
Izaak WaltonLet me tell you that every misery I miss is a new blessing. [Not only be grateful for the good that you have but also for the bad you don't!]
Izaak WaltonLook to your health: and if you have it, praise God, and value it next to a good conscience; for health is the second blessing that we mortals are capable of; a blessing that money cannot buy; and therefore value it.
Izaak Walton