In every action there are the three elements of loss, acquisition and value. The quality and measure of each of these three elements should be weighed before undertaking any action.
The wise do not launch an undertaking by which, for a possible future gain, they will lose what is already got.
The wise conserve what is already gained before entering on a doubtful undertaking.
Plan fully before launching out on action. To think of devising ways and means in the course of the action is fatal.
Think well before resolving on action. Hesitation after the decision is taken is bad. These two are complementary principles of action.
Tiruvalluvar in Tirukural