Jim Cramer always recommended identifying bullish themes and then putting money to work behind those themes.
And one of his favorite themes for 2013 is domestic energy; specifically the discovery of vast resources in the United States and the resulting efforts to harness the finds. (Read More: Energy Boom - Jim Cramer ID's Stocks to Watch)
Cramer thinks the theme could generate profits not only this year, but for a long time to come.
Although he thinks domestic oil finds are important, Cramer is particularly keen on the prospects of natural gas.
It's a cleaner fuel than oil and coal and the price of nat gas makes it an affordable alternative. In fact it's so affordable that "Other countries are desperate to get their hands on our natural gas," Cramer said.