There is such a mysterious and intimate connection between the mind and body, that one cannot be wearied or suffer, without affecting the other. When the mind is fatigued and exhausted, it affects the body, and this again reacts on the mind. Every person ought to be aware, that the more anxiously and intensely the mind is interested on any subject, the greater is the need of _exercise_, _sleep_ and _frequent relaxation_. Attention to religion, does not demand that _all_ lawful business be suspended, and forbids the neglect of all needful rest and exercise; but be very cautious here, lest you mistake _negligence_ in religion, for a necessary attention to the health. 11. Do not expect to be made very happy by religion, unless you become _eminent_ christians. A _half way_ christian can neither enjoy the pleasures of the world nor the pleasures of religion; for his conscience will not let him seek the one, and he is too indolent to obtain the other. The christian may be the happiest man on earth, but he must be a faithful, active, and devoted christian. None are disappointed in finding religion a source of unfailing peace and joy, but those who refuse to drink deep of the wells of salvation; unless we except those who, from some derangement of the nervous system, or failure of health, do not enjoy the clear and undisturbed exercise of their faculties. A healthy mind in a healthy body, may always be made happy by religion. 12. Do not look at the practice and example of _other_ christians, in forming the standard of piety at which you aim. The allowance of this thing, has probably had a more disastrous influence on the church and on the world, than all other causes that could be named. Generally, when persons commence a christian life, their consciences are susceptible and tender. They are strict and watchful in the performance of duty, and are pained even by a slight neglect. They have been wont to feel, that becoming religious implies a _great_ change; that “old things must pass away and _all things_ become new.” But when they begin to look around among their christian friends, and turn to them for aid, and those who have had experience and have made advances in christian life, they find that _they_ seem to look upon duties and deficiencies in a very different manner. _They_ seem to neglect many things which the young christian has felt to be very important; and to practice many things which he had supposed inconsistent with religion. _Then commences the disastrous effect._ The young christian begins to feel that he need not be more particular than those to whom he has ever looked up with deference and respect. He begins to imagine that he has been rather _too strict_ and particular. He begins to take a retrograde course, and though his conscience and the bible often check and reprove, yet after a few inefficient struggles, he lowers his standard and walks as others do.