Don't wait. The time will never be just right.
Opportunities are like sunrises. If you wait too long, you miss them.
Timing is everything.
I'm a firm believer in that you've got to strike the iron when it's hot.
I'd better make hay while the sun shines.
I beseech you not to blame me if I be desirous to strike while the iron is hot.
The world does not wait for you.
You got to get it while you can.
Nothing is more expensive than a missed opportunity.
You gotta strike while the iron's hot.
Time and tide wait for no man.
Between too early and too late, there is never more than a moment.
Every opportunity passed is lost.