An object in motion tends to remain in motion along a straight line unless acted upon by an outside force.

If a projectile were deprived of the force of gravity, it would not be deflected toward the earth but would go off in a straight line into the heavens and do so with uniform motion, provided that the resistance of the air were removed.

The straight line belongs to men, the curved one to God.

The straight line leads to the downfall of humanity.

أعرف أن الخط المستقيم هو أقرب وأسرع طريق إلى نقطتين .. أي أنه أقصر من الخط الملتوي هذا صحيح في الهندسة .. ولكن في الحياة فإن الخط الأعوج هو الذي يصل أسرع ويملأ جيبك أكثر

The straight line is ungodly.