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"Some men succeed because they are destined to, but most men because they are determined to."

"Making a decision, even a bad one, is better than making no decision at all."

-Jesse Aweida

And pehaps the most fitting quote to go along with the one you have given.....

"We make our decisions, and then our decisions turn around and make us."

-R.W. Boreham

Basically let them know that every choice we make will affect us in some way or another down the road. Doing things will have a bigger impact then waiting for things to happen.

"Regardless of circumstances, each man lives in a world of his own making."

-Joseph Murray Emms

You must be responsible for your choices and their consequenses. Edgar Cayce