Never underestimate others.They may do much work unseen by you.

Never overestimate yourself.You can be merely a fool in others 'eyes.

Never expect too much about the future while it is quite hard to foresee and you are more likely to fail than you reckon.

Never consider too many boring things while you neglect many details which can condemn your death.

Never worship your past,just look at presence.

Step by step, with an increasing a,your v will rise awfully.