He has hay on his horns.
Seize the day, put no trust in tomorrow.
Begin, be bold and venture to be wise.
Carpe diem! Rejoice while you are alive; enjoy the day; live life to the fullest; make the most of what you have. It is later than you think.
Don't think, just do.
Faults are soon copied.
Choose a subject equal to your abilities; think carefully what your shoulders may refuse, and what they are capable of bearing.
Great effort is required to arrest decay and restore vigor. One must exercise proper deliberation, plan carefully before making a move, and be alert in guarding against relapse following a renaissance.
Force without wisdom falls of its own weight.