Drawing a ‘Futile’ Cycle using Tikz

I was in need of a diagram of a futile cycle. I tried illustator but I didn’t have the right LaTeX fonts so the figure did blend well with the rest of the document. I decided to make one using TiKz. And here it is.




\begin{tikzpicture}[>=latex',node distance = 2.5cm]
\node (S2) {$S_2$};
\node [left of = S2] (S1) {$S_1$};

\node [left of = S1, node distance = 1.5cm] (Xo) {};
\draw[->,thick] (Xo) to node[above] {$v_1$} (S1);

\node [right of = S2, node distance = 1.5cm] (X1) {};
\draw[->,thick] (S2) to node[above] {$v_4$} (X1);

\draw [->,thick] (S2) to [bend left=40] node[below] {$v_3$} (S1);
\draw [->,thick] (S1) to [bend left=40] node[above] {$v_3$} (S2);

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