My dear, make best use of rest of the youth period as every thing is lost in the old age, even attention towards God Almighty and the life hereafter. From among the deceptions of Satan and self-inclination, are that they give the youths promise of correction and improvement in the old age. Until the last moment, it prevent human from remembrance of God and sincerity with hollow promises. It would snatch away faith at the last moment of death if it had not been successful in the past. Stand up during youth period since you have more energy at this point, and avoid from others than God Almighty. Do your best to cement relationship with God. If you have still not maintained connections with God, then try to accomplish and make efforts in a bid to strengthen these relations. No being is deserved for your relationship except the God Almighty.
(Secret of prayers- ascending of spirituality seekers and prayer of mystics, Preface, P. 29)