From Meng Jiao's
孟郊 Tang-dynasty poem
《登科后》 (After Passing the Imperial Exam). Full couplet:
春风得意马蹄疾,一日看尽长安花 - 'spring breeze, all going my way, hooves flying; in one day I see every flower in Chang'an.' Meng wrote it at age 46 after finally passing the jinshi exam, overjoyed after decades of failure. The first half gave us the idiom
春风得意.