There's a story of a young soldier who illustrates this idea of "taking your opportunities" or "seizing the day" or "acting on a purpose."
A young soldier and his commanding officer got on a train together. The only available seats were across from an attractive young woman who was traveling with her grandmother. As they engaged in pleasant conversation, the soldier and the young woman kept eyeing one another; the attraction was obviously mutual.
Suddenly the train went into a tunnel and the car became pitch black. Immediately two sounds were heard: the smack of a kiss, and the whack of a slap across the face.
The grandmother thought, "I can't believe he kissed my granddaughter, but I'm glad she gave him the slap he deserved." The commanding officer thought, "I don't blame the boy for kissing the girl, but it's a shame she missed his face and hit me instead." The young girl thought, "I'm glad he kissed me, but I wish my grandmother hadn't slapped him for doing it."
And as the train broke into the sunlight, the soldier could not wipe the smile off his face. He had just seized the opportunity to kiss a pretty girl and slap his commanding officer and had gotten away with both!