No fortune has been made without courage and conviction.  But many a fortune has been lost pushing luck onto dwindling odds.

Not to bet is a bet.  Staying on the sidelines is a bet that doing nothing will produce better results than the risk-adjusted returns of doing anything.  Staying on the sidelines demonstrates faith in a future of opportunities.  And staying on the sidelines provides much needed opportunities for rest and reflection. 

Conviction without follow-through is cowardice*.  But patience in times of uncertainty is the beginning of wisdom.  

* Those lacking conviction in anything should stay out of the markets.