From Oneness - Great Principles Shared By All Religions, by Jeffrey Rosen:

 Truth Is Universal

All scripture is inspired by God, and profitable for teaching, for reproof, for correction, and for training in righteousness, that the man of God may be complete, equipped for every good work. - Christianity

We believe in God, and that which hath been sent down to us, and that which hath been sent down to Abraham... and that which hath been given to Moses and to Jesus, and that which was given to the prophets from their Lord. We make no distinction between any of them: and to God are we resigned. - Islam

Do not decry other sects, do not deprecate others, but rather honor whatever in them is worthy of honor. - Buddhism

In varying ways the sages have described
The same unvarying and essential truths;
There is no real conflict between them all. - Hinduism

Truth does not depart from human nature. If what is regarded as truth departs from human nature, it may not be regarded as truth. - Confucianism

Allow us to recognize Thee in all Thy holy names and forms: as Rama, as Krishna, as Buddha. Let us know thee as Abraham, as Solomon, as Zarathustra, as Moses, as Jesus, as Mohammed, and in many other names and forms, known and unknown to the world. - Sufism