Thou must be true thyself.
If thou the truth wouldst teach;
The soul must overflow if thou
Another's soul wouldst reach; [ Horatius Bonar ]

Be what thou wouldst seem to be. [ English Proverb, collected by George Herbert ]

Wouldst thou wisely, and with pleasure,
Pass the days of life's short measure,
From the slow one counsel take,
But a tool of him never make;
Ne'er as friend the swift one know,
Nor the constant one as foe. [ Schiller ]

Sow truth, if thou the truth wouldst reap;
Who sows the false will reap the vain;
Erect and sound thy conscience keep,
From hollow words and deeds refrain. [ Horatius Bonar ]

Didst thou but know the inly touch of love,
Thou wouldst as soon go kindle fire with snow
As seek to quench the fire of love with words. [ William Shakespeare, Two Gentlemen of Verona. Act II. Sc. 7 ]

Therefore, if at great things thou wouldst arrive,
Get riches first, get wealth. [ Milton ]

What! wouldst thou have a serpent sting thee twice? [ William Shakespeare ]

Acquaint thyself with God, if thou wouldst taste His works. [ Cowper ]

Wouldst thou unlock the door to cold despair and knowing pensiveness? [ George Herbert ]

Wouldst thou subject all things to thyself? Subject thyself to reason. [ Seneca ]

It is thy duty oftentimes to do what thou wouldst not; thy duty, too, to leave undone that thou wouldst do. [ Thomas a Kempis ]

If thou wouldst attain to thy highest, go look upon a flower; what that does willessly, that do thou willingly. [ Schiller ]

To continue eternally young is, as poets write, the highest bliss of life; wouldst thou attain to it, thou must die young. [ Rückert ]

If thou wouldst find much favor and peace with God and man, be very low in thine own eyes; forgive thyself little, and others much. [ Robert Leighton ]

The prayer of Lahire: God! do unto Lahire what thou wouldst Lahire should do unto Thee, if Thou were Lahire, and if Lahire were Thee!

From a common custom of swearing men easily slide into perjury; therefore, if thou wouldst not be perjured, do not use thyself to swear. [ Hierocles ]

If thou wouldst preserve a sound body, use fasting, and walking; if a healthful soul, fasting and praying; walking exercises the body, praying exercises the soul, fasting cleanses both. [ Quarles ]